diff --git a/src/dynamicMesh/fvMeshSubset/fvMeshSubset.C b/src/dynamicMesh/fvMeshSubset/fvMeshSubset.C
index ccd4ec5ddaf36e34327cc107d251eede376836f6..78bd7b1ddb2bcf635bf4d3562c2ba87f5e85d9be 100644
--- a/src/dynamicMesh/fvMeshSubset/fvMeshSubset.C
+++ b/src/dynamicMesh/fvMeshSubset/fvMeshSubset.C
@@ -980,7 +980,7 @@ void Foam::fvMeshSubset::setCellSubset
             baseMesh().name(),
             baseMesh().time().timeName(),
             baseMesh().time(),
-            IOobject::NO_READ,
+            IOobject::READ_IF_PRESENT,
             IOobject::NO_WRITE
         ),
         std::move(newPoints),
diff --git a/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.C b/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.C
index 019a4e8526cd6172f72338968d060a4b894be8d4..eaedbb3e47e628ca98d459816859fd229758572f 100644
--- a/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.C
+++ b/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.C
@@ -5,6 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
+    Copyright (C) 2020 OpenFOAM Foundation
     Copyright (C) 2020 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
diff --git a/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.H b/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.H
index 57bcd5872b5855678d4df915bd3eccded38d14d4..c367ecf9b188cec160cece3f5cbcc5aa7ab84a7e 100644
--- a/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.H
+++ b/src/finiteVolume/fvMesh/fvGeometryScheme/stabilised/stabilisedFvGeometryScheme.H
@@ -27,8 +27,12 @@ Class
     Foam::stabilisedFvGeometryScheme
 
 Description
-    Geometry calculation scheme with automatic stabilisation for high-aspect
-    ratio cells.
+    Geometry calculation scheme that implements face geometry calculation
+    using normal-component-of-area weighted triangle contributions.
+
+    This implements the Foundation 'Corrected face-centre calculations'
+    as a separate geometry scheme. Only implements the primitiveMesh parts,
+    not the individual face calculation.
 
 SourceFiles
     stabilisedFvGeometryScheme.C
@@ -60,15 +64,7 @@ protected:
 
     // Protected Member Functions
 
-        //- Calculate cell and face weight. Is 0 for cell < minAspect, 1 for
-        //  cell > maxAspect
-        void calcAspectRatioWeights
-        (
-            scalarField& cellWeight,
-            scalarField& faceWeight
-        ) const;
-
-        //- Calculate face area and centre
+        //- Calculate face area and centre weighted using pyramid height
         static void makeFaceCentresAndAreas
         (
             const polyMesh& mesh,
@@ -77,16 +73,6 @@ protected:
             vectorField& fAreas
         );
 
-        ////- Calculate cell volume and centre (copy of primitiveMesh
-        ////  functionality)
-        //static void makeCellCentresAndVols
-        //(
-        //    const polyMesh& mesh,
-        //    const vectorField& fCtrs,
-        //    const vectorField& fAreas,
-        //    vectorField& cellCtrs_s,
-        //    scalarField& cellVols_s
-        //);
 
 private:
 
diff --git a/src/meshTools/polyTopoChange/polyTopoChange.H b/src/meshTools/polyTopoChange/polyTopoChange.H
index 613f6d398f3bafb16e051d0ca40b2d44c46da63d..00fd3603b3ec65586d574ea609c2469f648ec1f2 100644
--- a/src/meshTools/polyTopoChange/polyTopoChange.H
+++ b/src/meshTools/polyTopoChange/polyTopoChange.H
@@ -617,7 +617,8 @@ public:
                 const bool orderPoints = false
             );
 
-            //- Create new mesh with old mesh patches
+            //- Create new mesh with old mesh patches. Additional dictionaries
+            //  (fv* etc) read according to IO flags
             template<class Type>
             autoPtr<mapPolyMesh> makeMesh
             (
diff --git a/src/meshTools/polyTopoChange/polyTopoChangeTemplates.C b/src/meshTools/polyTopoChange/polyTopoChangeTemplates.C
index 9989d54f2af5bafd9b9ac471ad152255ac66f1c7..8f02476777549b578335b1ada263ffa5d2143d55 100644
--- a/src/meshTools/polyTopoChange/polyTopoChangeTemplates.C
+++ b/src/meshTools/polyTopoChange/polyTopoChangeTemplates.C
@@ -182,14 +182,14 @@ Foam::autoPtr<Foam::mapPolyMesh> Foam::polyTopoChange::makeMesh
     // Create the mesh
     // ~~~~~~~~~~~~~~~
 
-    IOobject noReadIO(io);
-    noReadIO.readOpt() = IOobject::NO_READ;
-    noReadIO.writeOpt() = IOobject::AUTO_WRITE;
+    //IOobject noReadIO(io);
+    //noReadIO.readOpt() = IOobject::NO_READ;
+    //noReadIO.writeOpt() = IOobject::AUTO_WRITE;
     newMeshPtr.reset
     (
         new Type
         (
-            noReadIO,
+            io,         //noReadIO
             std::move(newPoints),
             std::move(faces_),
             std::move(faceOwner_),
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/Allclean b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/Allclean
new file mode 100755
index 0000000000000000000000000000000000000000..1e0a8525559d9ac73e3009393aeaec0be4836929
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/Allclean
@@ -0,0 +1,9 @@
+#!/bin/sh
+cd "${0%/*}" || exit                                # Run from this directory
+. ${WM_PROJECT_DIR:?}/bin/tools/CleanFunctions      # Tutorial clean functions
+#------------------------------------------------------------------------------
+
+cleanCase0
+rm -rf constant/extendedFeatureEdgeMesh
+
+#------------------------------------------------------------------------------
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/Allrun b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/Allrun
new file mode 100755
index 0000000000000000000000000000000000000000..539592d552178414db89032a29ed45056079ae20
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/Allrun
@@ -0,0 +1,22 @@
+#!/bin/sh
+cd "${0%/*}" || exit                                # Run from this directory
+. ${WM_PROJECT_DIR:?}/bin/tools/RunFunctions        # Tutorial run functions
+#------------------------------------------------------------------------------
+
+runApplication blockMesh
+runApplication surfaceFeatureExtract
+
+mkdir -p 0
+
+# Run with basic
+foamDictionary -entry geometry.type -set basic system/fvSchemes
+runApplication -s basic snappyHexMesh
+runApplication -s basic checkMesh -writeAllFields
+foamListTimes -rm
+
+# Run with highAspectRatio
+foamDictionary -entry geometry.type -set highAspectRatio system/fvSchemes
+runApplication -s highAspectRatio snappyHexMesh
+runApplication -s highAspectRatio checkMesh -writeAllFields
+
+#------------------------------------------------------------------------------
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/transportProperties b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/transportProperties
new file mode 100644
index 0000000000000000000000000000000000000000..60041417e7ace7e44613ec90089a1ff649222aef
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/transportProperties
@@ -0,0 +1,32 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2006                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      transportProperties;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+// Air temperature at standard atmospheric pressure = 540 R = 300 K
+// See README.md
+// c = 347.336 [m/s]
+// Ma = UInf/c = 0.15
+// UInf = 52.1004 [m/s]
+// ReChord = 6e6 (per chord)
+// Chord = 1 [m]
+// ReChord = UInf*Chord/nuFluid
+// nuFluid = UInf*Chord/ReChord = 8.6834e-06 [m2/s]
+
+transportModel  Newtonian;
+
+nu              8.6834e-06;
+
+
+// ************************************************************************* //
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.curvature b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.curvature
new file mode 100644
index 0000000000000000000000000000000000000000..e2fa245cdcd9bcdbaa872a00bcbbd7c2e46e0bb3
Binary files /dev/null and b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.curvature differ
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.eMesh b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.eMesh
new file mode 100644
index 0000000000000000000000000000000000000000..bf37d53d469ad9eae98e770a4cc51a0fe69f74d8
Binary files /dev/null and b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.eMesh differ
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.stl b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.stl
new file mode 100644
index 0000000000000000000000000000000000000000..0a53c45b7737a0e2513ebdb414da22765ffb1615
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/aerofoil.stl
@@ -0,0 +1,3586 @@
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diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/internalFace.stl b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/internalFace.stl
new file mode 100644
index 0000000000000000000000000000000000000000..b55bf09361c6212e7b2f8f50737095e61e3fe190
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/constant/triSurface/internalFace.stl
@@ -0,0 +1,72 @@
+solid PART_6
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diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/blockMeshDict b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/blockMeshDict
new file mode 100644
index 0000000000000000000000000000000000000000..c3e1035399d618211b5a79a285bb73d138858511
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/blockMeshDict
@@ -0,0 +1,56 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  dev                                   |
+|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      blockMeshDict;
+}
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+convertToMeters 1;
+
+vertices
+(
+    (-1 -1 -1)
+    ( 2 -1 -1)
+    ( 2  0 -1)
+    (-1  0 -1)
+    (-1 -1  1)
+    ( 2 -1  1)
+    ( 2  0  1)
+    (-1  0  1)
+);
+
+blocks
+(
+//    hex (0 1 2 3 4 5 6 7) (15 10 10) simpleGrading (1 1 1)
+    hex (0 1 2 3 4 5 6 7) (15 5 10) simpleGrading (1 1 1)
+);
+
+edges
+();
+boundary
+(
+    airFlow
+    {
+        type patch;
+        faces
+        (
+            (3 7 6 2)
+            (1 5 4 0)  //back
+            (2 6 5 1)  //outlet
+            (0 4 7 3)  //inlet
+            (0 3 2 1)  //lowerWall
+            (4 5 6 7)  //upperWall
+        );
+    }
+
+);
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/controlDict b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/controlDict
new file mode 100644
index 0000000000000000000000000000000000000000..85986fc7d44762f6965daa830898a1a96c1172d3
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/controlDict
@@ -0,0 +1,55 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2006                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      controlDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+//DebugSwitches
+//{
+//    fvGeometryScheme    1;
+//    highAspectRatio     1;
+//    basic               1;
+//}
+
+application     simpleFoam;
+
+startFrom       startTime;
+
+startTime       0;
+
+stopAt          endTime;
+
+endTime         15000;
+
+deltaT          1;
+
+writeControl    timeStep;
+
+writeInterval   5000;
+
+purgeWrite      2;
+
+writeFormat     binary;
+
+writePrecision  15;
+
+writeCompression off;
+
+timeFormat      general;
+
+timePrecision   8;
+
+runTimeModifiable false;
+
+
+// ************************************************************************* //
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/fvSchemes b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/fvSchemes
new file mode 100644
index 0000000000000000000000000000000000000000..5e852737745eb11e5f1d6fec8bdfa89bad29a75a
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/fvSchemes
@@ -0,0 +1,73 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2006                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+FoamFile
+{
+    version         2;
+    format          ascii;
+    class           dictionary;
+    object          fvSchemes;
+}
+
+ddtSchemes
+{
+    default         steadyState;
+}
+
+gradSchemes
+{
+    default         Gauss linear;
+    grad(p)         Gauss linear;
+    unlimitedGrad(U) Gauss linear;
+}
+
+divSchemes
+{
+    default         none;
+    div(phi,U)      bounded Gauss linearUpwindV unlimitedGrad(U);
+    turbulence      bounded Gauss limitedLinear 1;
+    div(phi,k)      bounded Gauss limitedLinear 1;
+    div(phi,omega)  bounded Gauss limitedLinear 1;
+    div(phi,nuTilda) bounded Gauss limitedLinear 1;
+    div(phi,epsilon) bounded Gauss limitedLinear 1;
+    div(phi,phit)   bounded Gauss limitedLinear 1;
+    div(phi,f)      bounded Gauss limitedLinear 1;
+    div(phi,gammaInt) bounded Gauss linearUpwind grad;
+    div(phi,ReThetat) bounded Gauss linearUpwind grad;
+    div((nuEff*dev2(T(grad(U))))) Gauss linear;
+}
+
+laplacianSchemes
+{
+    default         Gauss linear limited corrected 0.33;
+}
+
+interpolationSchemes
+{
+    default         linear;
+}
+
+snGradSchemes
+{
+    default         limited corrected 0.33;
+}
+
+wallDist
+{
+    method          meshWave;
+}
+
+geometry
+{
+    type            highAspectRatio;
+    minAspect       10;
+    maxAspect       100;
+}
+
+
+// ************************************************************************* //
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/fvSolution b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/fvSolution
new file mode 100644
index 0000000000000000000000000000000000000000..4ad470198b34489e3261f05d2ca99335509e0aa4
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/fvSolution
@@ -0,0 +1,71 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2006                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      fvSolution;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+solvers
+{
+    p
+    {
+        solver          GAMG;
+        smoother        GaussSeidel;
+        tolerance       1e-06;
+        relTol          0.1;
+    }
+
+    "(U|k|omega|nuTilda|gammaInt|ReThetat)"
+    {
+        solver          smoothSolver;
+        smoother        symGaussSeidel;
+        tolerance       1e-08;
+        relTol          0.1;
+        maxIter         50;
+    }
+
+    "(epsilon|phit)"
+    {
+         solver          PBiCGStab;
+         preconditioner  DILU;
+         tolerance       1e-8;
+         relTol          0;
+    }
+
+    f
+    {
+        solver          PBiCGStab;
+        preconditioner  DIC;
+        tolerance       1e-8;
+        relTol          0;
+    }
+}
+
+SIMPLE
+{
+    nNonOrthogonalCorrectors 0;
+    consistent          true;
+}
+
+relaxationFactors
+{
+    equations
+    {
+        ".*"            0.9;
+        "(gammaInt|ReThetat|k|nuTilda)"    0.8;
+        "(phit|f)"      0.7;
+        epsilon         0.5;
+    }
+}
+
+
+// ************************************************************************* //
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/meshQualityDict b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/meshQualityDict
new file mode 100644
index 0000000000000000000000000000000000000000..467ab8ac82937ce7051e579e719d3951b21dc248
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/meshQualityDict
@@ -0,0 +1,78 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v1912                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      meshQualityDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+//- Maximum non-orthogonality allowed. Set to 180 to disable.
+maxNonOrtho 65;
+
+//- Max skewness allowed. Set to <0 to disable.
+maxBoundarySkewness 20;
+maxInternalSkewness 4;
+
+//- Max concaveness allowed. Is angle (in degrees) below which concavity
+//  is allowed. 0 is straight face, <0 would be convex face.
+//  Set to 180 to disable.
+maxConcave 80;
+
+//- Minimum pyramid volume. Is absolute volume of cell pyramid.
+//  Set to a sensible fraction of the smallest cell volume expected.
+//  Set to very negative number (e.g. -1E30) to disable.
+minVol 1e-13;
+
+//- Minimum quality of the tet formed by the face-centre
+//  and variable base point minimum decomposition triangles and
+//  the cell centre. Set to very negative number (e.g. -1E30) to
+//  disable.
+//     <0 = inside out tet,
+//      0 = flat tet
+//      1 = regular tet
+minTetQuality 1e-15;
+
+//- Minimum face area. Set to <0 to disable.
+minArea -1;
+
+//- Minimum face twist. Set to <-1 to disable. dot product of face normal
+//  (itself the average of the triangle normals)
+//  and face centre triangles normal
+minTwist 0.02;
+
+//- Minimum normalised cell determinant. This is the determinant of all
+//  the areas of internal faces. It is a measure of how much of the
+//  outside area of the cell is to other cells. The idea is that if all
+//  outside faces of the cell are 'floating' (zeroGradient) the
+//  'fixedness' of the cell is determined by the area of the internal faces.
+//  1 = hex, <= 0 = folded or flattened illegal cell
+minDeterminant 0.001;
+
+//- Relative position of face in relation to cell centres (0.5 for orthogonal
+//  mesh) (0 -> 0.5)
+minFaceWeight 0.05;
+
+//- Volume ratio of neighbouring cells (0 -> 1)
+minVolRatio 0.01;
+
+//- Per triangle normal compared to that of preceding triangle. Must be >0
+//  for Fluent compatibility
+minTriangleTwist -1;
+
+
+//- If >0 : preserve cells with all points on the surface if the
+//  resulting volume after snapping (by approximation) is larger than
+//  minVolCollapseRatio times old volume (i.e. not collapsed to flat cell).
+//  If <0 : delete always.
+//minVolCollapseRatio 0.1;
+
+
+// ************************************************************************* //
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/snappyHexMeshDict b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/snappyHexMeshDict
new file mode 100644
index 0000000000000000000000000000000000000000..dd4c92631e3eb6d32b42b29836cf45e5e0f09c3b
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/snappyHexMeshDict
@@ -0,0 +1,753 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v1912                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      snappyHexMeshDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+// Which of the steps to run
+castellatedMesh true;
+snap            true;
+addLayers       true;
+
+
+// Optional: single region surfaces get patch names according to
+//           surface only. Multi-region surfaces get patch name
+//           surface "_ "region. Default is true
+// singleRegionName false;
+
+// Optional: avoid patch-face merging. Allows mesh to be used for
+//           refinement/unrefinement
+// mergePatchFaces    false; // default true
+
+// Optional: preserve all generated patches. Default is to remove
+//          zero-sized patches.
+// keepPatches true;
+
+
+// Geometry. Definition of all surfaces. All surfaces are of class
+// searchableSurface.
+// Surfaces are used
+// - to specify refinement for any mesh cell intersecting it
+// - to specify refinement for any mesh cell inside/outside/near
+// - to 'snap' the mesh boundary to the surface
+geometry
+{
+    refinement1
+    {
+        type searchableBox;
+        min (-1 -2 -1);
+        max ( 1  2  1);
+    }
+/*
+    // Shell for directional refinement
+    wakeBox
+    {
+        type searchableBox;
+        min (1.5 1 -0.5);
+        max (3.5 2 0.5);
+    }
+*/
+    internalFace.stl { name internalFace; type triSurfaceMesh;}
+
+    aerofoil.stl
+    {
+        name aerofoil;
+        type triSurfaceMesh;
+
+        //tolerance   1E-5;   // optional:non-default tolerance on intersections
+        //maxTreeDepth 10;    // optional:depth of octree. Decrease only in case
+                              // of memory limitations.
+
+        // Per region the patchname. If not provided will be <surface>_<region>.
+        // Note: this name cannot be used to identity this region in any
+        //       other part of this dictionary; it is only a name
+        //       for the combination of surface+region (which is only used
+        //       when creating patches)
+//        regions
+//        {
+//            secondSolid
+//            {
+//                name mySecondPatch;
+//            }
+//        }
+    }
+
+/*
+    sphere2
+    {
+        type searchableSphere;
+        centre  (1.5 1.5 1.5);
+        radius  1.03;
+    }
+*/
+};
+
+
+// Settings for the castellatedMesh generation.
+castellatedMeshControls
+{
+
+    // Refinement parameters
+    // ~~~~~~~~~~~~~~~~~~~~~
+
+    // If local number of cells is >= maxLocalCells on any processor
+    // switches from from refinement followed by balancing
+    // (current method) to (weighted) balancing before refinement.
+    maxLocalCells 1000000;
+
+    // Overall cell limit (approximately). Refinement will stop immediately
+    // upon reaching this number so a refinement level might not complete.
+    // Note that this is the number of cells before removing the part which
+    // is not 'visible' from the keepPoint. The final number of cells might
+    // actually be a lot less.
+    maxGlobalCells 20000000;
+
+    // The surface refinement loop might spend lots of iterations refining just
+    // a few cells. This setting will cause refinement to stop if
+    // <= minRefinementCells cells are selected for refinement. Note: it will
+    // at least do one iteration unless
+    //  a: the number of cells to refine is 0
+    //  b: minRefinementCells = -1. This is a special value indicating
+    //     no refinement.
+    minRefinementCells 0;
+
+    // Allow a certain level of imbalance during refining
+    // (since balancing is quite expensive)
+    // Expressed as fraction of perfect balance (= overall number of cells /
+    // nProcs). 0=balance always.
+    maxLoadUnbalance 0.10;
+
+    // Number of buffer layers between different levels.
+    // 1 means normal 2:1 refinement restriction, larger means slower
+    // refinement.
+    nCellsBetweenLevels 4;
+
+
+    // Explicit feature edge refinement
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    // Specifies a level for any cell intersected by explicitly provided
+    // edges.
+    // This is a featureEdgeMesh, read from constant/triSurface for now.
+    // Specify 'levels' in the same way as the 'distance' mode in the
+    // refinementRegions (see below). The old specification
+    //      level   2;
+    // is equivalent to
+    //      levels  ((0 2));
+
+    features
+    (
+        {
+            file "aerofoil.eMesh";
+            level 0;        // Have level 2 for all cells intersected
+        //                      // by feature.
+        //    levels ((0.1 2)); // Have level 2 for all cells within
+        //                      // 0.1 of feature.
+        }
+    );
+
+
+    // Surface based refinement
+    // ~~~~~~~~~~~~~~~~~~~~~~~~
+
+    // Specifies two levels for every surface. The first is the minimum level,
+    // every cell intersecting a surface gets refined up to the minimum level.
+    // The second level is the maximum level. Cells that 'see' multiple
+    // intersections where the intersections make an
+    // angle > resolveFeatureAngle get refined up to the maximum level.
+
+    refinementSurfaces
+    {
+        internalFace { level (0 0); faceZone internalFace; }//faceType baffle;}
+        aerofoil
+        {
+            // Surface-wise min and max refinement level
+            level (2 2);
+
+
+
+
+            //- Optional increment (on top of max level) in small gaps
+            //gapLevelIncrement 2;
+
+            //- Optional angle to detect small-large cell situation
+            //  perpendicular to the surface. Is the angle of face w.r.t.
+            //  the local surface normal. Use on flat(ish) surfaces only.
+            //  Otherwise leave out or set to negative number.
+            //perpendicularAngle 10;
+
+            //- Optional faceZone and (for closed surface) cellZone with
+            //  how to select the cells that are in the cellZone
+            //  (inside / outside / specified insidePoint)
+            //  The orientation of the faceZone is
+            //  - if on cellZone(s) : point out of (minimum) cellZone
+            //  - if freestanding   : oriented according to surface
+
+            //faceZone sphere;
+            //cellZone sphere;
+            //cellZoneInside inside;    // outside/insidePoint
+            //insidePoint    (1 1 1);   // if (cellZoneInside == insidePoint)
+
+            //- Optional specification of what to do with faceZone faces:
+            //      internal : keep them as internal faces (default)
+            //      baffle   : create baffles from them. This gives more
+            //                 freedom in mesh motion
+            //      boundary : create free-standing boundary faces (baffles
+            //                 but without the shared points)
+            //faceType baffle;
+        }
+    }
+
+    // Feature angle:
+    // - used if min and max refinement level of a surface differ
+    // - used if feature snapping (see snapControls below) is used
+    resolveFeatureAngle 30;
+
+    //- Optional increment (on top of max level) in small gaps
+    //gapLevelIncrement 2;
+
+
+    // Planar angle:
+    // - used to determine if surface normals
+    //   are roughly the same or opposite. Used
+    //      - in proximity refinement
+    //      - to decide when to merge free-standing baffles
+    //        (if e.g. running in surfaceSimplify mode set this to 180 to
+    //         merge all baffles)
+    //      - in snapping to avoid snapping to nearest on 'wrong' side
+    //        of thin gap
+    //
+    // If not specified same as resolveFeatureAngle
+    planarAngle 30;
+
+
+    // Region-wise refinement
+    // ~~~~~~~~~~~~~~~~~~~~~~
+
+    // Specifies refinement level for cells in relation to a surface. One of
+    // three modes
+    // - distance. 'levels' specifies per distance to the surface the
+    //   wanted refinement level. The distances need to be specified in
+    //   increasing order.
+    // - inside. 'levels' is only one entry and only the level is used. All
+    //   cells inside the surface get refined up to the level. The surface
+    //   needs to be closed for this to be possible.
+    // - outside. Same but cells outside.
+
+    refinementRegions
+    {
+//        refinement1
+//        {
+//            mode inside;
+//            levels ((1.0 1));
+//        }
+/*
+        //sphere.stl
+        //{
+        //    mode inside;
+        //    levels ((1.0 4));
+        //    // Optional override of uniform refinement level such
+        //    // that in small gaps we're getting more cells.
+        //    // The specification is
+        //    //  - numGapCells : minimum number of cells in the gap
+        //    //                  (usually >3; lower than this might not
+        //    //                   resolve correctly)
+        //    //  - minLevel    : min refinement level at which to kick in
+        //    //  - maxLevel    : upper refinement level (to avoid refinement
+        //    //                  continuing on a single extraneous feature)
+        //    // All three settings can be overridden on a surface by
+        //    // surface basis in the refinementSurfaces section.
+        //    gapLevel (<numGapCells> <minLevel> <maxlevel>);
+        //    // Optional: when doing the gapLevel refinement directly remove
+        //    //           based on orientation w.r.t. gap. This limits the
+        //    //           amount of cells before doing the 'locationInMesh'
+        //    //           cell selection. Default is 'mixed' i.e. keep cells
+        //    //           whilst doing the gap-level refinement.
+        //    //gapMode inside;  // inside/outside/mixed
+        //}
+
+        //wakeBox
+        //{
+        //    mode        inside;
+        //    // Dummy base level
+        //    levels      ((10000 0));
+        //
+        //    // Optional directional refinement (after all other refinement)
+        //    // Directional refinement
+        //    // for all cells according to 'mode' ('inside' or 'outside';
+        //    // 'distance' not supported) and within certain range. E.g.
+        //    //  - for all cells with level 2-5
+        //    //  - do one split in x direction
+        //    levelIncrement  (2 5 (1 0 0));
+        //
+        //    // Note
+        //    // - ignores 'levels' and gap* settings.
+        //    // - the cellLevel/pointLevels files are no longer consistent
+        //    //   with the mesh, the resulting mesh is no longer compatible
+        //    //   with e.g. dynamic refinement/unrefinement.
+        //    // - cellLevel will include any directional refinement
+        //    //   (i.e. it will be the maximum of all three directions)
+        //}
+
+        //wakeBox
+        //{
+        //    mode        inside;
+        //    // Dummy base level
+        //    levels      ((10000 0));
+        //
+        //    // Optional directional refinement (after all other refinement)
+        //    // Directional refinement
+        //    // for all cells according to 'mode' ('inside' or 'outside';
+        //    // 'distance' not supported) and within certain range. E.g.
+        //    //  - for all cells with level 2-5
+        //    //  - do one split in x direction
+        //    levelIncrement  (2 5 (1 0 0));
+        //
+        //    // Note
+        //    // - ignores 'levels' and gap* settings.
+        //    // - the cellLevel/pointLevels files are no longer consistent
+        //    //   with the mesh, the resulting mesh is no longer compatible
+        //    //   with e.g. dynamic refinement/unrefinement.
+        //    // - cellLevel will include any directional refinement
+        //    //   (i.e. it will be the maximum of all three directions)
+        //
+        //    // Optional directional expansion-ratio smoothing (after all
+        //    // refinement). This will try to smooth out edge/cell size jumps
+        //    // Specify smoothing direction and number of iterations
+        //    smoothDirection     (1 0 0);
+        //    // Smoothing of expansion ratio
+        //    nSmoothExpansion    100;
+        //    // Smoothing of positions
+        //    nSmoothPosition     100;
+        //}
+*/
+    }
+
+
+
+    // Optionally limit refinement in geometric region. This limits all
+    // refinement (from features, refinementSurfaces, refinementRegions)
+    // in a given geometric region. The syntax is exactly the same as for the
+    // refinementRegions; the cell level now specifies the upper limit
+    // for any cell. (a special setting is cell level -1 which will remove
+    // any cells inside the region). Note that it does not override the
+    // refinement constraints given by the nCellsBetweenLevels setting.
+    limitRegions
+    {
+    }
+
+
+    // Mesh selection
+    // ~~~~~~~~~~~~~~
+
+    // After refinement patches get added for all refinementSurfaces and
+    // all cells intersecting the surfaces get put into these patches. The
+    // section reachable from the location(s)InMesh is kept.
+    // NOTE: This point should never be on a face, always inside a cell, even
+    // after refinement.
+    //
+    // There are two different ways of specifying the regions to keep:
+    // 1. a single locationInMesh. This is the unzoned part of the mesh.
+    //    All the 'zoned' surfaces are marked as such
+    //    in the refinementSurfaces with the faceZone and cellZone keywords.
+    //    It is illegal to have the locationInMesh inside a surface for which
+    //    a cellZone is specified.
+    //
+    // or
+    //
+    // 2. multiple locationsInMesh, with per location the name of the cellZone.
+    //    This uses walking to determine zones and automatically creates
+    //    faceZones on the outside of cellZones. The special name 'none' is
+    //    used to indicate the unzoned/background part of the mesh.
+
+
+        // Ad 1. Specify a single location and how to treat faces inbetween
+        //       cellZones
+        locationInMesh (-0.457 -0.5 0.43);
+
+        // Whether any faceZones (as specified in the refinementSurfaces)
+        // are only on the boundary of corresponding cellZones.
+        // Not used if there are no faceZones. The behaviour has changed
+        // with respect to previous versions:
+        //  true  : all intersections with surface are put in faceZone
+        //          (same behaviour as before)
+        //  false : depending on the type of surface intersected:
+        //      - if intersecting surface has faceZone only (so no cellZone)
+        //        leave in faceZone (so behave as if set to true) (= changed
+        //        behaviour)
+        //      - if intersecting surface has faceZone and cellZone
+        //        remove if inbetween same cellZone or if on boundary
+        //        (same behaviour as before)
+        allowFreeStandingZoneFaces true;
+
+
+
+        // 2. Specify multiple locations with optional cellZones for the
+        //    regions (use cellZone "none" to specify the unzoned cells)
+        //    FaceZones are automatically constructed from the
+        //    names of the cellZones: <cellZoneA> _to_ <cellZoneB>
+        //    where the cellZoneA is the lowest numbered cellZone (non-cellZone
+        //    cells are in a special region called "none" which is always
+        //    last).
+
+
+
+
+    // Optional locations that should not be reachable from
+    // location(s)InMesh
+//    locationsOutsideMesh ((100 100 100));
+
+    // Optional: do not remove cells likely to give snapping problems
+    // handleSnapProblems false;
+
+    // Optional: switch off topological test for cells to-be-squashed
+    //           and use geometric test instead
+    //useTopologicalSnapDetection false;
+
+    // Optional: do not refine surface cells with opposite faces of
+    //           differing refinement levels
+    //interfaceRefine false;
+
+    // Optional: use an erosion instead of region assignment to allocate
+    //           left-over cells to the background region (i.e. make cellZones
+    //           consistent with the intersections of the surface).
+    //           Erosion is specified as a number of erosion iterations.
+    //           Erosion has less chance of bleeding and changing the zone
+    //           for a complete region.
+    //nCellZoneErodeIter 2;
+}
+
+// Settings for the snapping.
+snapControls
+{
+    // Number of patch smoothing iterations before finding correspondence
+    // to surface
+    nSmoothPatch 3;
+
+    // Optional: number of smoothing iterations for internal points on
+    // refinement interfaces. This will reduce non-orthogonality on
+    // refinement interfaces.
+    //nSmoothInternal $nSmoothPatch;
+
+    // Maximum relative distance for points to be attracted by surface.
+    // True distance is this factor times local maximum edge length.
+    tolerance 1.0;
+
+    // Number of mesh displacement relaxation iterations.
+    nSolveIter 30;
+
+    // Maximum number of snapping relaxation iterations. Should stop
+    // before upon reaching a correct mesh.
+    nRelaxIter 5;
+
+    // (wip) disable snapping to opposite near surfaces (revert to 22x
+    //  behaviour)
+    // detectNearSurfacesSnap false;
+
+
+    // Feature snapping
+
+        // Number of feature edge snapping iterations.
+        // Leave out altogether to disable.
+        nFeatureSnapIter 10;
+
+        // Detect (geometric only) features by sampling the surface
+        // (default=false).
+        implicitFeatureSnap false;
+
+        // Use castellatedMeshControls::features (default = true)
+        explicitFeatureSnap true;
+
+        // Detect features between multiple surfaces
+        // (only for explicitFeatureSnap, default = false)
+        multiRegionFeatureSnap false;
+
+
+        //- When to run face splitting (never at first iteration, always
+        //  at last iteration). Is interval. Default -1 (disabled)
+        //nFaceSplitInterval 5;
+
+
+        // (wip) Optional for explicit feature snapping:
+        //- Detect baffle edges. Default is true.
+        //detectBaffles false;
+        //- On any faces where points are on multiple regions (see
+        //  multiRegionFeatureSnap) have the other points follow these points
+        //  instead of having their own independent movement, i.e. have snapping
+        //  to multi-region edges/points take priority. This might aid snapping
+        //  to sharp edges that are also region edges. The default is false.
+        //releasePoints true;
+        //- Walk along feature edges, adding missing ones. Default is true.
+        //stringFeatures false;
+        //- If diagonal attraction also attract other face points. Default is
+        //  false
+        //avoidDiagonal true;
+        //- When splitting what concave faces to leave intact. Default is 45
+        //  degrees.
+        //concaveAngle 30;
+        //- When splitting the minimum area ratio of faces. If face split
+        //  causes ratio of area less than this do not split. Default is 0.3
+        //minAreaRatio 0.3;
+        //- Attract points only to the surface they originate from. Default
+        //  false. This can improve snapping of intersecting surfaces.
+          strictRegionSnap true;
+}
+
+// Settings for the layer addition.
+addLayersControls
+{
+    // Are the thickness parameters below relative to the undistorted
+    // size of the refined cell outside layer (true) or absolute sizes (false).
+    relativeSizes true;
+
+    // Layer thickness specification. This can be specified in one of following
+    // ways:
+    // - expansionRatio and finalLayerThickness (cell nearest internal mesh)
+    // - expansionRatio and firstLayerThickness (cell on surface)
+    // - overall thickness and firstLayerThickness
+    // - overall thickness and finalLayerThickness
+    // - overall thickness and expansionRatio
+    //
+    // Note: the mode thus selected is global, i.e. one cannot override the
+    //       mode on a per-patch basis (only the values can be overridden)
+
+        // Expansion factor for layer mesh
+        expansionRatio 1.5;
+
+        // Wanted thickness of the layer furthest away from the wall.
+        // If relativeSizes this is relative to undistorted size of cell
+        // outside layer.
+        finalLayerThickness 0.3;
+
+        // Wanted thickness of the layer next to the wall.
+        // If relativeSizes this is relative to undistorted size of cell
+        // outside layer.
+        //firstLayerThickness 0.3;
+
+        // Wanted overall thickness of layers.
+        // If relativeSizes this is relative to undistorted size of cell
+        // outside layer.
+        //thickness 0.5
+
+
+    // Minimum overall thickness of total layers. If for any reason layer
+    // cannot be above minThickness do not add layer.
+    // If relativeSizes this is relative to undistorted size of cell
+    // outside layer..
+    minThickness 0.1;
+
+
+    // Per final patch or faceZone (so not geometry!) the layer information
+    // Note: This behaviour changed after 21x. Any non-mentioned patches
+    //       now slide unless:
+    //          - nSurfaceLayers is explicitly mentioned to be 0.
+    //          - angle to nearest surface < slipFeatureAngle (see below)
+    layers
+    {
+        "internalFace.*" {nSurfaceLayers 20; }
+        aerofoil
+        {
+            nSurfaceLayers 20;
+
+        }
+    }
+
+    // If points get not extruded do nGrow layers of connected faces that are
+    // also not grown. This helps convergence of the layer addition process
+    // close to features.
+    // Note: changed(corrected) w.r.t 1.7.x! (didn't do anything in 1.7.x)
+    nGrow -1;
+
+    // Advanced settings
+
+
+    // Static analysis of starting mesh
+
+        // When not to extrude surface. 0 is flat surface, 90 is when two faces
+        // are perpendicular. Note: was not working correctly < 1806
+        featureAngle 180;
+
+        // When to merge patch faces. Default is featureAngle. Useful when
+        // featureAngle is large.
+        //mergePatchFacesAngle 45;
+
+        // Stop layer growth on highly warped cells
+        maxFaceThicknessRatio 1000;//0.5;
+
+
+    // Patch displacement
+
+        // Number of smoothing iterations of surface normals
+        nSmoothSurfaceNormals 1;
+
+        // Smooth layer thickness over surface patches
+        nSmoothThickness 10;
+
+
+
+    // Choice of mesh shrinking algorithm
+
+        // Optional mesh shrinking algorithm (default is displacementMedialAxis)
+        // The displacementMotionSolver is a wrapper around the displacement
+        // motion solvers. It needs specification of the solver to use and
+        // its control dictionary.
+        //meshShrinker displacementMotionSolver;
+        //solver displacementLaplacian;
+        //displacementLaplacianCoeffs
+        //{
+        //    diffusivity quadratic inverseDistance
+        //    (
+        //        sphere.stl_firstSolid
+        //        maxY
+        //    );
+        //}
+        // Note that e.g. displacementLaplacian needs entries in
+        // fvSchemes, fvSolution. Also specify a minIter > 1 when solving
+        // cellDisplacement since otherwise solution might not be sufficiently
+        // accurate on points.
+
+
+    // Medial axis analysis (for use with default displacementMedialAxis)
+
+        // Angle used to pick up medial axis points
+        // Note: changed(corrected) w.r.t 1.7.x! 90 degrees corresponds to 130
+        // in 1.7.x.
+        minMedialAxisAngle 90;
+
+        // Reduce layer growth where ratio thickness to medial
+        // distance is large
+        maxThicknessToMedialRatio 0.3;
+
+        // Number of smoothing iterations of interior mesh movement direction
+        nSmoothNormals 3;
+
+        // Optional: limit the number of steps walking away from the surface.
+        // Default is unlimited.
+        //nMedialAxisIter 10;
+
+        // Optional: smooth displacement after medial axis determination.
+        // default is 0.
+        //nSmoothDisplacement 90;
+
+        // (wip)Optional: do not extrude any point where
+        //   (false) : all surrounding faces are not fully extruded
+        //   (true)  : all surrounding points are not extruded
+        // Default is false.
+        //detectExtrusionIsland true;
+
+        // Optional: do not extrude around sharp edges if both faces are not
+        // fully extruded i.e. if one of the faces on either side would
+        // become a wedge.
+        // Default is 0.5*featureAngle. Set to -180 always attempt extrusion
+        //layerTerminationAngle 25;
+
+        // Optional: disable shrinking of edges that have one (or two) points
+        // on an extruded patch.
+        // Default is false to enable single/two cell thick channels to still
+        // have layers. In <=1806 this was true by default. On larger gaps it
+        // should have no effect.
+        //disableWallEdges true;
+
+        // Optional: at non-patched sides allow mesh to slip if extrusion
+        // direction makes angle larger than slipFeatureAngle. Default is
+        // 0.5*featureAngle.
+        slipFeatureAngle 10;
+
+        // Maximum number of snapping relaxation iterations. Should stop
+        // before upon reaching a correct mesh.
+        nRelaxIter 5;
+
+
+    // Mesh shrinking
+
+        // Create buffer region for new layer terminations, i.e. gradually
+        // step down number of layers. Set to <0 to terminate layer in one go.
+        nBufferCellsNoExtrude 0;
+
+        // Overall max number of layer addition iterations. The mesher will
+        // exit if it reaches this number of iterations; possibly with an
+        // illegal mesh.
+        nLayerIter 50;
+
+        // Max number of iterations after which relaxed meshQuality controls
+        // get used. Up to nRelaxedIter it uses the settings in
+        // meshQualityControls,
+        // after nRelaxedIter it uses the values in
+        // meshQualityControls::relaxed.
+        nRelaxedIter 0;
+
+        // Additional reporting: if there are just a few faces where there
+        // are mesh errors (after adding the layers) print their face centres.
+        // This helps in tracking down problematic mesh areas.
+        //additionalReporting true;
+}
+
+// Generic mesh quality settings. At any undoable phase these determine
+// where to undo.
+meshQualityControls
+{
+    // Specify mesh quality constraints in separate dictionary so can
+    // be reused (e.g. checkMesh -meshQuality)
+    #include "meshQualityDict"
+
+    minDeterminant 1e-8;
+
+    // Optional : some meshing phases allow usage of relaxed rules.
+    // See e.g. addLayersControls::nRelaxedIter.
+    relaxed
+    {
+        // Maximum non-orthogonality allowed. Set to 180 to disable.
+        maxNonOrtho 75;
+        minTetQuality -1e30;
+        minTwist    -1;
+    }
+
+
+    // Advanced
+
+        // Number of error distribution iterations
+        nSmoothScale 4;
+        // amount to scale back displacement at error points
+        errorReduction 0.75;
+}
+
+// Advanced
+
+//// Debug flags
+//debugFlags
+//(
+//    mesh            // write intermediate meshes
+//    intersections   // write current mesh intersections as .obj files
+//    featureSeeds    // write information about explicit feature edge
+//                    // refinement
+//    attraction      // write attraction as .obj files
+//    layerInfo       // write information about layers
+//);
+//
+//// Write flags
+//writeFlags
+//(
+//    scalarLevels    // write volScalarField with cellLevel for postprocessing
+//    layerSets       // write cellSets, faceSets of faces in layer
+//    layerFields     // write volScalarField for layer coverage
+//);
+
+
+//// Format for writing lines. E.g. leak path. Default is vtk format.
+//setFormat ensight;
+
+// Merge tolerance. Is fraction of overall bounding box of initial mesh.
+// Note: the write tolerance needs to be higher than this.
+mergeTolerance 1e-6;
+
+// ************************************************************************* //
diff --git a/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/surfaceFeatureExtractDict b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/surfaceFeatureExtractDict
new file mode 100644
index 0000000000000000000000000000000000000000..12cc383824cdd466c19891b2ab54c9ea554f50e3
--- /dev/null
+++ b/tutorials/mesh/snappyHexMesh/airfoilWithLayers/system/surfaceFeatureExtractDict
@@ -0,0 +1,47 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v1912                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      surfaceFeatureExtractDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+aerofoil.stl
+{
+    // Extract raw features (none | extractFromFile | extractFromSurface)
+    extractionMethod    extractFromSurface;
+
+    // Mark edges whose adjacent surface normals are at an angle less
+    // than includedAngle as features
+    // - 0  : selects no edges
+    // - 180: selects all edges
+    includedAngle       120;
+
+curvature true;
+    // Do not mark region edges
+    geometricTestOnly   yes;
+
+    // Generate additional intersection features (none | self | region)
+    intersectionMethod  none;
+
+    // Tolerance for surface intersections
+    // tolerance           1e-3;
+
+// Output options:
+
+    // Write features to obj format for postprocessing
+    writeObj            yes;
+}
+
+
+
+
+// ************************************************************************* //