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wallViscosityI.H

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00001 /*---------------------------------------------------------------------------*\
00002   =========                 |
00003   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
00004    \\    /   O peration     |
00005     \\  /    A nd           | Copyright (C) 1991-2005 OpenCFD Ltd.
00006      \\/     M anipulation  |
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00008 License
00009     This file is part of OpenFOAM.
00010 
00011     OpenFOAM is free software; you can redistribute it and/or modify it
00012     under the terms of the GNU General Public License as published by the
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00015 
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00020 
00021     You should have received a copy of the GNU General Public License
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00023     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
00024 
00025 Global
00026     wallViscosity
00027 
00028 Description
00029     Calculate wall viscosity from wall-functions.
00030 
00031 \*---------------------------------------------------------------------------*/
00032 
00033 {
00034     scalar Cmu25 = pow(Cmu.value(), 0.25);
00035 
00036     const fvPatchList& patches = mesh_.boundary();
00037 
00038     forAll(patches, patchi)
00039     {
00040         const fvPatch& curPatch = patches[patchi];
00041 
00042         if (isType<wallFvPatch>(curPatch))
00043         {
00044             const scalarField& rhow = rho_.boundaryField()[patchi];
00045 
00046             const scalarField muw = mu().boundaryField()[patchi];
00047             scalarField& mutw = mut_.boundaryField()[patchi];
00048 
00049             forAll(curPatch, facei)
00050             {
00051                 label faceCelli = curPatch.faceCells()[facei];
00052 
00053                 scalar yPlus =
00054                     Cmu25*turbulenceModel::y_[patchi][facei]
00055                    *sqrt(k_[faceCelli])/(muw[facei]/rhow[facei]);
00056 
00057                 if (yPlus > yPlusLam_)
00058                 {
00059                     mutw[facei] = 
00060                         muw[facei]
00061                        *(yPlus*kappa_/log(E_*yPlus) - 1);
00062                 }
00063                 else
00064                 {
00065                     mutw[facei] = 0.0;
00066                 }
00067             }
00068         }
00069     }
00070 }
00071 
00072 
00073 // ************************************************************************* //
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