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Commit 72fb77cc authored by Mattijs Janssens's avatar Mattijs Janssens
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updated sample dictionary

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applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
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− 151
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...@@ -22,161 +22,171 @@ FoamFile ...@@ -22,161 +22,171 @@ FoamFile
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Which phases to run. // Which of the steps to run
doRefine true; castellatedMesh true;
doSnap true; snap true;
doLayers true; // includes autoMergeFaces addLayers false;
// Whether to dump intermediate meshes and print lots // Geometry. Definition of all surfaces. All surfaces are of class
// 1 : write mesh // searchableSurface.
// 2 : write volScalarField with cellLevel for postprocessing // Surfaces are used
// 4 : write current intersections as .obj files // - to specify refinement for any mesh cell intersecting it
debug 0; // - to specify refinement for any mesh cell inside/outside/near
// - to 'snap' the mesh boundary to the surface
refineDict geometry
{
// box1x1x1
// {
// type searchableBox;
// min (1.5 1 -0.5);
// max (3.5 2 0.5);
// }
//
// sphere.stl
// {
// type triSurfaceMesh;
//
// // Per region the patchname. If not provided will be <name>_<region>.
// regions
// {
// secondSolid
// {
// name mySecondPatch;
// }
// }
// }
sphere2
{
type searchableSphere;
centre (1.5 1.5 1.5);
radius 1.03;
}
};
// Settings for the castellatedMesh generation.
castellatedMeshControls
{ {
// Which part to keep.
// NOTE: This point should never be on a face, always inside a cell, even
// after refinement.
keepPoints ((3 0.28 0.43));
// Whether to remove/split cells likely to give problems when snapping
handleSnapProblems on;
// Merge tolerance. Is fraction of overall bounding box of initial mesh // Refinement parameters
mergeTolerance 1E-6; // ~~~~~~~~~~~~~~~~~~~~~
// While refining maximum number of cells per processor. This is basically // While refining maximum number of cells per processor. This is basically
// the number of cells that fit on a processor. If you choose this too small // the number of cells that fit on a processor. If you choose this too small
// it will do just more refinement iterations to obtain a similar mesh. // it will do just more refinement iterations to obtain a similar mesh.
procCellLimit 1000000; maxLocalCells 1000000;
// Overall cell limit (approximately). Refinement will stop immediately // Overall cell limit (approximately). Refinement will stop immediately
// upon reaching this number so a refinement level might not complete. // upon reaching this number so a refinement level might not complete.
// Note that this is the number of cells before removing the part which // 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 // is not 'visible' from the keepPoint. The final number of cells might
// be a lot less. // actually be a lot less.
cellLimit 2000000; maxGlobalCells 2000000;
// The surface refinement loop might spend lots of iterations refining just a // The surface refinement loop might spend lots of iterations refining just a
// few cells. This setting will cause refinement to stop if <= minimumRefine // few cells. This setting will cause refinement to stop if <= minimumRefine
// are selected for refinement. Note: it will at least do one iteration // are selected for refinement. Note: it will at least do one iteration
// (unless the number of cells to refine is 0) // (unless the number of cells to refine is 0)
minimumRefine 0; minRefinementCells 0;
// Number of buffer layers between different levels. // Number of buffer layers between different levels.
// 1 means normal 2:1 refinement restriction, larger means slower // 1 means normal 2:1 refinement restriction, larger means slower
// refinement. // refinement.
nBufferLayers 1; nCellsBetweenLevels 1;
// Feature Edge Refinement // Explicit feature edge refinement
// ~~~~~~~~~~~~~~~~~~~~~~~ // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// External feature file. Read from constant/triSurface for now. // Specifies a level for any cell intersected by its edges.
// Limitations: // This is a featureEdgeMesh, read from constant/triSurface for now.
// - either start or edge of any feature line has to be inside domain
// and be visible from keepPoint on starting mesh.
// - refining cells containing features is separate phase before refining
// based on surface.
// - no load balancing, no check for cellLimit is done while doing this.
features features
( (
// { //{
// file "someLine.eMesh"; // file "someLine.eMesh";
// level 2; // level 2;
// } //}
); );
// Internal Mesh Refinement
// ~~~~~~~~~~~~~~~~~~~~~~~~
// Specifies the areas where the refinement has to be a certain level.
// These surfaces have to be closed. Refinement is either inside
// (refineInside = true) or outside. (note:insideness or outsideness
// is with respect to far away)
// Note:that even using these the transition can never be faster than
// nBufferLayers!
// Note:the refinement level can never be higher than any of the surfaces
// they overlap with. See below for the surface refinement level specification.
refinementShells
(
{
//type triSurfaceMesh;
//name cube1x1x1.stl;
type searchableBox;
name box1x1x1;
min (2.5 -0.5 -0.5);
max (3.5 0.5 0.5);
level 4;
refineInside true;
}
);
// Surface based refinement // Surface based refinement
// ~~~~~~~~~~~~~~~~~~~~~~~~ // ~~~~~~~~~~~~~~~~~~~~~~~~
// Curvature. Cosine of angle between two neighbouring surface intersections. // Specifies two levels for every surface. The first is the minimum level,
// Only used if cell level > minLevel and < maxLevel. // every cell intersecting a surface gets refined up to the minimum level.
curvature 0.5; // 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
// Overall the refinement is according to the following rules: {
// - if the cell-cell vector intersects a surface any cell that sphere.stl
// is less refined than the minRefinementLevel of the surface gets refined.
// - else if the refinement level of the cell is between the
// minRefinementLevel and maxRefinementLevel the cell gets refined if
// - the normal of neighbouring surface intersections differ by more
// than above curvature
// - or if neighbouring surface intersections are on different surfaces or
// different surface regions.
// surfaces
surfaces
(
{ {
name sphere; // Surface-wise min and max refinement level
file "sphere.stl"; level (2 2);
// Surface wide refinement level // Optional region-wise level specification
minRefinementLevel 1;
maxRefinementLevel 1;
// Layers
surfaceLayers 1;
// Region specific refinement level
regions regions
( {
{ secondSolid
name firstSolid;
minRefinementLevel 3;
maxRefinementLevel 3;
surfaceLayers 2;
}
{ {
name secondSolid; level (3 3);
minRefinementLevel 1;
maxRefinementLevel 1;
surfaceLayers 1;
} }
); }
} }
); }
resolveFeatureAngle 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
// descending 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
{
//box1x1x1
//{
// mode inside;
// levels ((1.0 4));
//}
//sphere.stl
//{
// mode distance;
// levels ((1.0 5) (2.0 3));
//}
}
// 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 locationInMesh is kept.
// NOTE: This point should never be on a face, always inside a cell, even
// after refinement.
locationInMesh (5 0.28 0.43);
} }
// For snapping
snapDict
// Settings for the snapping.
snapControls
{ {
//- Number of patch smoothing iterations before finding correspondence //- Number of patch smoothing iterations before finding correspondence
// to surface // to surface
...@@ -185,47 +195,64 @@ snapDict ...@@ -185,47 +195,64 @@ snapDict
//- Relative distance for points to be attracted by surface feature point //- Relative distance for points to be attracted by surface feature point
// or edge. True distance is this factor times local // or edge. True distance is this factor times local
// maximum edge length. // maximum edge length.
snapTol 4.0; tolerance 4.0;
//- Whether to move internal mesh as well as boundary
smoothMesh true;
//- Number of mesh displacement smoothing iterations. //- Number of mesh displacement relaxation iterations.
nSmoothDispl 30; nSolveIter 30;
//- Maximum number of snapping relaxation iterations. Should stop //- Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh. // before upon reaching a correct mesh.
nSnap 5; nRelaxIter 5;
} }
// For cell layers
layerDict // Settings for the layer addition.
addLayersControls
{ {
//- When not to extrude surface. 0 is flat surface, 90 is when two faces // Per final patch (so not geometry!) the layer information
// make straight angle. layers
featureAngle 60; {
sphere.stl_firstSolid
{
nSurfaceLayers 1;
//- Maximum number of snapping relaxation iterations. Should stop }
// before upon reaching a correct mesh. maxY
nSnap 5; {
nSurfaceLayers 1;
}
}
// Expansion factor for layer mesh
expansionRatio 1.0;
//- Wanted thickness of final added cell layer. If multiple layers
// is the
// thickness of the layer furthest away from the wall.
// Relative to undistorted size of cell outside layer.
finalLayerRatio 0.3;
//- Minimum thickness of cell layer. If for any reason layer cannot be //- Minimum thickness of cell layer. If for any reason layer
// above minThickness do not add layer if thickness below minThickNess. // cannot be above minThickness do not add layer.
// Relative to undistorted cell size // Relative to undistorted size of cell outside layer.
minThickness 0.25; minThickness 0.25;
//- If points get not extruded do nGrow layers of connected faces that are //- If points get not extruded do nGrow layers of connected faces that are
// not grown. Is used to not do layers at all close to features. // also not grown. This helps convergence of the layer addition process
// close to features.
nGrow 1; nGrow 1;
// Expansion factor for layer mesh
expansionRatio 1.3;
// Ratio of cell size in final added cell layer to cell size // Advanced settings
// outside layer
finalLayerRatio 0.3; //- When not to extrude surface. 0 is flat surface, 90 is when two faces
// make straight angle.
featureAngle 60;
//- Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh.
nRelaxIter 5;
// Number of smoothing iterations of surface normals // Number of smoothing iterations of surface normals
nSmoothSurfaceNormals 1; nSmoothSurfaceNormals 1;
...@@ -248,20 +275,14 @@ layerDict ...@@ -248,20 +275,14 @@ layerDict
// Create buffer region for new layer terminations // Create buffer region for new layer terminations
nBufferCellsNoExtrude 0; nBufferCellsNoExtrude 0;
thickness 0.5;
nSmoothDispl 4;
} }
// For mesh motion
motionDict
{
//
// Mesh Quality Parameters. Decide when mesh is good enough to stop
// smoothing.
//
// Generic mesh quality settings. At any undoable phase these determine
// where to undo.
meshQualityControls
{
//- Maximum non-orthogonality allowed. Set to 180 to disable. //- Maximum non-orthogonality allowed. Set to 180 to disable.
maxNonOrtho 65; maxNonOrtho 65;
...@@ -298,10 +319,10 @@ motionDict ...@@ -298,10 +319,10 @@ motionDict
//- minVolRatio (0 -> 1) //- minVolRatio (0 -> 1)
minVolRatio 0.01; minVolRatio 0.01;
//must be >0 for Fluent compatibility //must be >0 for Fluent compatibility
minTriangleTwist -1; minTriangleTwist -1;
// Advanced // Advanced
//- Number of error distribution iterations //- Number of error distribution iterations
...@@ -311,4 +332,19 @@ motionDict ...@@ -311,4 +332,19 @@ motionDict
} }
// Advanced
// Flags for optional output
// 0 : only write final meshes
// 1 : write intermediate meshes
// 2 : write volScalarField with cellLevel for postprocessing
// 4 : write current intersections as .obj files
debug 0;
// Merge tolerance. Is fraction of overall bounding box of initial mesh.
// Note: the write tolerance needs to be higher than this.
mergeTolerance 1E-6;
// ************************************************************************* // // ************************************************************************* //
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