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-   -   How to compile an unsteady solver based on solver of MRFSimpleFoam? (http://www.cfd-online.com/Forums/openfoam-solving/75493-how-compile-unsteady-solver-based-solver-mrfsimplefoam.html)

renyun0511 April 27, 2010 11:16

How to compile an unsteady solver based on solver of MRFSimpleFoam?
 
hi all ,
i had a problem several days ago,but i can't resolve it yet.so i hope someone here would help me,thanks in advance!
the problem is:
As we know,the MRFSimpleFoam solver of OpenFOAM can't be done with unsteady flow,so i just add a PISO loop to modify it to unsteady solver. but from the picture of residuals which result from the modified solver,it appeared the result of steady solver does.
i don't know where is the error.would someone help me?
the modified code file is :
\*---------------------------------------------------------------------------*/
#include "fvCFD.H"
#include "incompressible/singlePhaseTransportModel/singlePhaseTransportModel.H"
#include "incompressible/RASModel/RASModel.H"
#include "MRFZones.H"
#include "IFstream.H"
#include "OFstream.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
int main(int argc, char *argv[])
{
# include "setRootCase.H"
# include "createTime.H"
# include "createMesh.H"
# include "createFields.H"
# include "initContinuityErrs.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Info<< "\nStarting time loop\n" << endl;
for (runTime++; !runTime.end(); runTime++)
{
Info<< "Time = " << runTime.timeName() << nl << endl;
# include "readPISOControls.H"
# include "CourantNo.H"
// Pressure-velocity SIMPLE corrector
{
// Momentum predictor
tmp<fvVectorMatrix> UEqn
( fvm::ddt(U)
+ fvm::div(phi, U)
+ turbulence->divDevReff(U)
);
mrfZones.addCoriolis(UEqn());
UEqn().relax();
solve(UEqn() == -fvc::grad(p));
//PISO loop
for (int corr=0;corr<nCorr;corr++)
{
volScalarField rAU = 1.0/UEqn().A();

U = rAU*UEqn().H();

phi = (fvc::interpolate(U) & mesh.Sf())
+ fvc::ddtPhiCorr(rAU,U,phi);

adjustPhi(phi, U, p);

p.boundaryField().updateCoeffs();

mrfZones.relativeFlux(phi);

// Non-orthogonal pressure corrector loop
for (int nonOrth=0; nonOrth<=nNonOrthCorr; nonOrth++)
{
fvScalarMatrix pEqn
(
fvm::laplacian(rAU, p) == fvc::div(phi)
);
pEqn.setReference(pRefCell, pRefValue);
pEqn.solve();
if (nonOrth == nNonOrthCorr)
{
phi -= pEqn.flux();
}
}
# include "continuityErrs.H"
// Explicitly relax pressure for momentum corrector
p.relax();
// Momentum corrector
U -= rAU*fvc::grad(p);
U.correctBoundaryConditions();
}
}
turbulence->correct();
runTime.write();
Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
<< " ClockTime = " << runTime.elapsedClockTime() << " s"
<< nl << endl;
}
Info<< "End\n" << endl;
return(0);
}

// ************************************************** *********************** //


regards!


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