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foam-extend4.1-coherent-io/applications/solvers/coupled/MRFPorousFoam/UEqn.H
2016-03-18 11:44:28 +00:00

94 lines
2.3 KiB
C

{
volScalarField divPhi
(
"divPhi",
fvc::div(phi)
);
// Momentum equation
fvVectorMatrix UEqn
(
fvm::div(phi, U)
+ turbulence->divDevReff(U)
);
// Add MRF sources
mrfZones.addCoriolis(UEqn);
// Add porous sources
tmp<volTensorField> tTU;
if (addPorosity)
{
tTU = tmp<volTensorField>
(
new volTensorField
(
IOobject
(
"TU",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::NO_WRITE
),
mesh,
dimensionedTensor("zero", dimless/dimTime, tensor::zero)
)
);
volTensorField& TU = tTU();
pZones.addResistance(UEqn, TU);
trTU = inv(TU + tensor(I)*UEqn.A());
trTU().rename("rAU");
}
else
{
trAU = 1.0/UEqn.A();
trAU().rename("rAU");
}
// Insert the additional components. Note this will destroy the H and A
UEqn += fvm::SuSp(-divPhi, U) + divPhi*U;
UEqn.relax();
// Insert momentum equation
UpEqn.insertEquation(0, UEqn);
if (addPorosity)
{
// Manually over-ride the 3x3 block to handle the off-diagonal
// part of the Ap coefficient
const tensorField& TUIn = tTU().internalField();
CoeffField<vector4>::squareTypeField& DD = UpEqn.diag().asSquare();
const scalarField& V = mesh.V().field();
// Note: this insertion should only happen in porous cell zones
// A rewrite of the porousZones class interface is needed.
// HJ, 14/Mar/2016
forAll (TUIn, cellI)
{
const scalar& cellV = V[cellI];
const tensor& cellTU = TUIn[cellI];
CoeffField<vector4>::squareType& cellDD = DD[cellI];
cellDD(0, 0) += cellV*cellTU.xx();
cellDD(0, 1) += cellV*cellTU.xy();
cellDD(0, 2) += cellV*cellTU.xz();
cellDD(1, 0) += cellV*cellTU.yx();
cellDD(1, 1) += cellV*cellTU.yy();
cellDD(2, 2) += cellV*cellTU.yz();
cellDD(2, 0) += cellV*cellTU.zx();
cellDD(2, 1) += cellV*cellTU.zy();
cellDD(2, 2) += cellV*cellTU.zz();
}
}
}