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ENH: Updated film contact force model

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andy
2011-06-01 16:45:15 +01:00
parent abb392047d
commit e40b86a7b3
1 changed files with 27 additions and 3 deletions
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30
src/regionModels/surfaceFilmModels/submodels/kinematic/force/contactAngleForce/contactAngleForce.C
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@ -27,6 +27,7 @@ License
#include "addToRunTimeSelectionTable.H" #include "addToRunTimeSelectionTable.H"
#include "fvcGrad.H" #include "fvcGrad.H"
#include "unitConversion.H" #include "unitConversion.H"
#include "fvPatchField.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
@ -109,7 +110,8 @@ tmp<fvVectorMatrix> contactAngleForce::correct(volVectorField& U)
); );
volVectorField gradAlpha(fvc::grad(alpha)); volVectorField gradAlpha(fvc::grad(alpha));
scalarField nHits(force.size(), 0.0);
scalarField nHits(owner_.regionMesh().nCells(), 0.0);
forAll(nbr, faceI) forAll(nbr, faceI)
{ {
@ -129,6 +131,7 @@ tmp<fvVectorMatrix> contactAngleForce::correct(volVectorField& U)
if (cellI != -1) if (cellI != -1)
{ {
// const scalar dx = Foam::sqrt(magSf[cellI]); // const scalar dx = Foam::sqrt(magSf[cellI]);
// bit of a cheat, but ok for regular meshes
const scalar dx = owner_.regionMesh().deltaCoeffs()[faceI]; const scalar dx = owner_.regionMesh().deltaCoeffs()[faceI];
const vector n = const vector n =
gradAlpha[cellI]/(mag(gradAlpha[cellI]) + ROOTVSMALL); gradAlpha[cellI]/(mag(gradAlpha[cellI]) + ROOTVSMALL);
@ -138,8 +141,29 @@ tmp<fvVectorMatrix> contactAngleForce::correct(volVectorField& U)
} }
} }
nHits = max(nHits, 1.0); forAll(delta.boundaryField(), patchI)
force /= (nHits*magSf); {
const fvPatchField<scalar>& df = delta.boundaryField()[patchI];
const scalarField& dx = df.patch().deltaCoeffs();
const labelUList& faceCells = df.patch().faceCells();
forAll(df, faceI)
{
label cellO = faceCells[faceI];
if ((delta[cellO] > deltaWet_) && (df[faceI] < deltaWet_))
{
const vector n =
gradAlpha[cellO]/(mag(gradAlpha[cellO]) + ROOTVSMALL);
scalar theta = cos(degToRad(distribution_->sample()));
force[cellO] += Ccf_*n*sigma[cellO]*(1.0 - theta)/dx[faceI];
nHits[cellO]++;
}
}
}
force /= (max(nHits, 1.0)*magSf);
tForce().correctBoundaryConditions();
if (owner_.regionMesh().time().outputTime()) if (owner_.regionMesh().time().outputTime())
{ {