ENH: updated buoyantBoussinesqPimpleFoam solver to include thermal wall functions

     on (kinematic) turbulent thermal conductivity, kappat and updated tutorial

applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/TEqn.H

 {
-    volScalarField kappaEff
-    (
-        "kappaEff",
-        turbulence->nu()/Pr + turbulence->nut()/Prt
-    );
+    kappat = turbulence->nut()/Prt;
+    kappat.correctBoundaryConditions();
+
+    volScalarField kappaEff("kappaEff", turbulence->nu()/Pr + kappat);
 
     fvScalarMatrix TEqn
     (

applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/createFields.H

@@ -52,6 +52,21 @@
         incompressible::RASModel::New(U, phi, laminarTransport)
     );
 
+    // kinematic turbulent thermal thermal conductivity m2/s
+    Info<< "Reading field kappat\n" << endl;
+    volScalarField kappat
+    (
+        IOobject
+        (
+            "kappat",
+            runTime.timeName(),
+            mesh,
+            IOobject::MUST_READ,
+            IOobject::AUTO_WRITE
+        ),
+        mesh
+    );
+
     label pRefCell = 0;
     scalar pRefValue = 0.0;
     setRefCell

tutorials/heatTransfer/buoyantBoussinesqPimpleFoam/hotRoom/0/kappat

+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  dev                                   |
+|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       volScalarField;
+    location    "0";
+    object      kappat;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+dimensions      [0 2 -1 0 0 0 0];
+
+internalField   uniform 0;
+
+boundaryField
+{
+    floor
+    {
+        type            kappatJayatillekeWallFunction;
+        Prt             0.85;
+        value           uniform 0;
+    }
+    ceiling
+    {
+        type            kappatJayatillekeWallFunction;
+        Prt             0.85;
+        value           uniform 0;
+    }
+    fixedWalls
+    {
+        type            kappatJayatillekeWallFunction;
+        Prt             0.85;
+        value           uniform 0;
+    }
+}
+
+
+// ************************************************************************* //