diff --git a/src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutkRoughWallFunction/nutkRoughWallFunctionFvPatchScalarField.C b/src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutkRoughWallFunction/nutkRoughWallFunctionFvPatchScalarField.C new file mode 100644 index 000000000..f1211cf4c --- /dev/null +++ b/src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutkRoughWallFunction/nutkRoughWallFunctionFvPatchScalarField.C @@ -0,0 +1,249 @@ +/*---------------------------------------------------------------------------*\ + ========= | + \\ / F ield | foam-extend: Open Source CFD + \\ / O peration | Version: 4.1 + \\ / A nd | Web: http://www.foam-extend.org + \\/ M anipulation | For copyright notice see file Copyright +------------------------------------------------------------------------------- +License + This file is part of foam-extend. + + foam-extend is free software: you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation, either version 3 of the License, or (at your + option) any later version. + + foam-extend is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with foam-extend. If not, see . + +\*---------------------------------------------------------------------------*/ + +#include "nutkRoughWallFunctionFvPatchScalarField.H" +#include "RASModel.H" +#include "fvPatchFieldMapper.H" +#include "volFields.H" +#include "addToRunTimeSelectionTable.H" + +// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // + +namespace Foam +{ +namespace incompressible +{ +namespace RASModels +{ + +// * * * * * * * * * * * * Protected Member Functions * * * * * * * * * * * // + +scalar nutkRoughWallFunctionFvPatchScalarField::fnRough +( + const scalar KsPlus, + const scalar Cs +) const +{ + // Return fn based on non-dimensional roughness height + + if (KsPlus < 90.0) + { + return pow + ( + (KsPlus - 2.25)/87.75 + Cs*KsPlus, + sin(0.4258*(log(KsPlus) - 0.811)) + ); + } + else + { + return (1.0 + Cs*KsPlus); + } +} + + +tmp nutkRoughWallFunctionFvPatchScalarField::calcNut() const +{ + const label patchI = patch().index(); + + const turbulenceModel& turbModel = + db().lookupObject("turbulenceModel"); + + const scalarField& y = turbModel.y()[patchI]; + const tmp tk = turbModel.k(); + const volScalarField& k = tk(); + const scalarField& nuw = turbModel.nu().boundaryField()[patchI]; + + const scalar Cmu25 = pow025(Cmu_); + + tmp tnutw(new scalarField(*this)); + scalarField& nutw = tnutw(); + + const unallocLabelList& fc = patch().faceCells(); + + forAll(nutw, faceI) + { + const label faceCellI = fc[faceI]; + + const scalar uStar = Cmu25*sqrt(k[faceCellI]); + const scalar yPlus = uStar*y[faceI]/nuw[faceI]; + const scalar KsPlus = uStar*Ks_[faceI]/nuw[faceI]; + + scalar Edash = E_; + + if (KsPlus > 2.25) + { + Edash /= fnRough(KsPlus, Cs_[faceI]); + } + + if (yPlus > yPlusLam_) + { + scalar limitingNutw = max(nutw[faceI], nuw[faceI]); + + // To avoid oscillations limit the change in the wall viscosity + // which is particularly important if it temporarily becomes zero + nutw[faceI] = + max + ( + min + ( + nuw[faceI] + *(yPlus*kappa_/log(max(Edash*yPlus, 1+1e-4)) - 1), + 2*limitingNutw + ), 0.5*limitingNutw + ); + } + + if (debug) + { + Info<< "yPlus = " << yPlus + << ", KsPlus = " << KsPlus + << ", Edash = " << Edash + << ", nutw = " << nutw[faceI] + << endl; + } + } + + return tnutw; +} + + +// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * // + +nutkRoughWallFunctionFvPatchScalarField::nutkRoughWallFunctionFvPatchScalarField +( + const fvPatch& p, + const DimensionedField& iF +) +: + nutkWallFunctionFvPatchScalarField(p, iF), + Ks_(p.size(), 0.0), + Cs_(p.size(), 0.0) +{} + + +nutkRoughWallFunctionFvPatchScalarField::nutkRoughWallFunctionFvPatchScalarField +( + const nutkRoughWallFunctionFvPatchScalarField& ptf, + const fvPatch& p, + const DimensionedField& iF, + const fvPatchFieldMapper& mapper +) +: + nutkWallFunctionFvPatchScalarField(ptf, p, iF, mapper), + Ks_(ptf.Ks_, mapper), + Cs_(ptf.Cs_, mapper) +{} + + +nutkRoughWallFunctionFvPatchScalarField::nutkRoughWallFunctionFvPatchScalarField +( + const fvPatch& p, + const DimensionedField& iF, + const dictionary& dict +) +: + nutkWallFunctionFvPatchScalarField(p, iF, dict), + Ks_("Ks", dict, p.size()), + Cs_("Cs", dict, p.size()) +{} + + +nutkRoughWallFunctionFvPatchScalarField::nutkRoughWallFunctionFvPatchScalarField +( + const nutkRoughWallFunctionFvPatchScalarField& rwfpsf +) +: + nutkWallFunctionFvPatchScalarField(rwfpsf), + Ks_(rwfpsf.Ks_), + Cs_(rwfpsf.Cs_) +{} + + +nutkRoughWallFunctionFvPatchScalarField::nutkRoughWallFunctionFvPatchScalarField +( + const nutkRoughWallFunctionFvPatchScalarField& rwfpsf, + const DimensionedField& iF +) +: + nutkWallFunctionFvPatchScalarField(rwfpsf, iF), + Ks_(rwfpsf.Ks_), + Cs_(rwfpsf.Cs_) +{} + + +// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * // + +void nutkRoughWallFunctionFvPatchScalarField::autoMap +( + const fvPatchFieldMapper& m +) +{ + nutkWallFunctionFvPatchScalarField::autoMap(m); + Ks_.autoMap(m); + Cs_.autoMap(m); +} + + +void nutkRoughWallFunctionFvPatchScalarField::rmap +( + const fvPatchScalarField& ptf, + const labelList& addr +) +{ + nutkWallFunctionFvPatchScalarField::rmap(ptf, addr); + + const nutkRoughWallFunctionFvPatchScalarField& nrwfpsf = + refCast(ptf); + + Ks_.rmap(nrwfpsf.Ks_, addr); + Cs_.rmap(nrwfpsf.Cs_, addr); +} + + +void nutkRoughWallFunctionFvPatchScalarField::write(Ostream& os) const +{ + fvPatchField::write(os); + writeLocalEntries(os); + Cs_.writeEntry("Cs", os); + Ks_.writeEntry("Ks", os); + writeEntry("value", os); +} + + +// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // + +makePatchTypeField +( + fvPatchScalarField, + nutkRoughWallFunctionFvPatchScalarField +); + +// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // + +} // End namespace RASModels +} // End namespace incompressible +} // End namespace Foam + +// ************************************************************************* // diff --git a/src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutkRoughWallFunction/nutkRoughWallFunctionFvPatchScalarField.H b/src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutkRoughWallFunction/nutkRoughWallFunctionFvPatchScalarField.H new file mode 100644 index 000000000..8ed37d45f --- /dev/null +++ b/src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutkRoughWallFunction/nutkRoughWallFunctionFvPatchScalarField.H @@ -0,0 +1,217 @@ +/*---------------------------------------------------------------------------*\ + ========= | + \\ / F ield | foam-extend: Open Source CFD + \\ / O peration | Version: 4.1 + \\ / A nd | Web: http://www.foam-extend.org + \\/ M anipulation | For copyright notice see file Copyright +------------------------------------------------------------------------------- +License + This file is part of foam-extend. + + foam-extend is free software: you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation, either version 3 of the License, or (at your + option) any later version. + + foam-extend is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with foam-extend. If not, see . + +Class + Foam::incompressible::RASModels::nutkRoughWallFunctionFvPatchScalarField + +Description + Boundary condition for turbulent (kinematic) viscosity when using wall + functions for rough walls. + + Manipulates the E parameter to account for roughness effects, based on + KsPlus. + + - roughness height = sand-grain roughness (0 for smooth walls) + - roughness constant = 0.5-1.0 (0.5 default) + +Usage + \table + Property | Description | Required | Default value + Ks | sand-grain roughness height | yes | + Cs | roughness constant | yes | + \endtable + + Example of the boundary condition specification: + \verbatim + + { + type nutkRoughWallFunction; + Ks uniform 0; + Cs uniform 0.5; + } + \endverbatim + +SourceFiles + nutkRoughWallFunctionFvPatchScalarField.C + +\*---------------------------------------------------------------------------*/ + +#ifndef nutkRoughWallFunctionFvPatchScalarField_H +#define nutkRoughWallFunctionFvPatchScalarField_H + +#include "nutkWallFunctionFvPatchScalarField.H" + +// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // + +namespace Foam +{ +namespace incompressible +{ +namespace RASModels +{ + +/*---------------------------------------------------------------------------*\ + Class nutkRoughWallFunctionFvPatchScalarField Declaration +\*---------------------------------------------------------------------------*/ + +class nutkRoughWallFunctionFvPatchScalarField +: + public nutkWallFunctionFvPatchScalarField +{ +protected: + + // Protected data + + //- Roughness height + scalarField Ks_; + + //- Roughness constant + scalarField Cs_; + + + // Protected Member Functions + + //- Compute the roughness function + virtual scalar fnRough(const scalar KsPlus, const scalar Cs) const; + + //- Calculate the turbulence viscosity + virtual tmp calcNut() const; + + +public: + + //- Runtime type information + TypeName("nutkRoughWallFunction"); + + + // Constructors + + //- Construct from patch and internal field + nutkRoughWallFunctionFvPatchScalarField + ( + const fvPatch&, + const DimensionedField& + ); + + //- Construct from patch, internal field and dictionary + nutkRoughWallFunctionFvPatchScalarField + ( + const fvPatch&, + const DimensionedField&, + const dictionary& + ); + + //- Construct by mapping given + // nutkRoughWallFunctionFvPatchScalarField + // onto a new patch + nutkRoughWallFunctionFvPatchScalarField + ( + const nutkRoughWallFunctionFvPatchScalarField&, + const fvPatch&, + const DimensionedField&, + const fvPatchFieldMapper& + ); + + //- Construct as copy + nutkRoughWallFunctionFvPatchScalarField + ( + const nutkRoughWallFunctionFvPatchScalarField& + ); + + //- Construct and return a clone + virtual tmp clone() const + { + return tmp + ( + new nutkRoughWallFunctionFvPatchScalarField(*this) + ); + } + + //- Construct as copy setting internal field reference + nutkRoughWallFunctionFvPatchScalarField + ( + const nutkRoughWallFunctionFvPatchScalarField&, + const DimensionedField& + ); + + //- Construct and return a clone setting internal field reference + virtual tmp clone + ( + const DimensionedField& iF + ) const + { + return tmp + ( + new nutkRoughWallFunctionFvPatchScalarField(*this, iF) + ); + } + + + // Member functions + + // Acces functions + + // Return Ks + scalarField& Ks() + { + return Ks_; + } + + // Return Cs + scalarField& Cs() + { + return Cs_; + } + + + // Mapping functions + + //- Map (and resize as needed) from self given a mapping object + virtual void autoMap(const fvPatchFieldMapper&); + + //- Reverse map the given fvPatchField onto this fvPatchField + virtual void rmap + ( + const fvPatchScalarField&, + const labelList& + ); + + + // I-O + + //- Write + virtual void write(Ostream&) const; +}; + + +// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // + +} // End namespace RASModels +} // End namespace incompressible +} // End namespace Foam + +// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // + +#endif + +// ************************************************************************* //