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-   -   developing icofoam in non-inertial system (http://www.cfd-online.com/Forums/openfoam-programming-development/98864-developing-icofoam-non-inertial-system.html)

luckygl March 20, 2012 21:45

developing icofoam in non-inertial system
 
2 Attachment(s)
hello everybody,
I try to use non-inertial system to solve heaving elliptic plate.

My present case is very simple.It's a 2D elliptic plate heaving cosinely.I add a source term into the N-S equation developing icoFoam.My boundary conditions also are changed into non-inertial system.

The new solver can be compiled and run successfully.But the result is totally wrong.I don't know where the problem is.

I attach my test case, so that someone who know this (which is not really difficult ;-)) can give me a hint.

Best regards and thanks in advance for any reply
Monica

PS:here is my solver
Code:

\*---------------------------------------------------------------------------*/
#include "fvCFD.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
int main(int argc, char *argv[])
{
    #include "setRootCase.H"
    #include "createTime.H"
    #include "createMesh.H"
    #include "createFields.H"
    #include "initContinuityErrs.H"
    volVectorField Ftmp = F;//store the initial value of F
    volVectorField Uetmp = Ue;//store the entangling velocity
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    Info<< "\nStarting time loop\n" << endl;
    while (runTime.loop())
    {
        Info<< "Time = " << runTime.timeName() << nl << endl;
        #include "readPISOControls.H"
        #include "CourantNo.H"

        dimensionedScalar t = runTime.value();// get current time
        F = Ftmp * cos(omega * t);//modify F of the internal field
        F.correctBoundaryConditions();//correct the boundary values
 
        fvVectorMatrix UrelEqn
        (
            fvm::ddt(Urel)
          + fvm::div(phi, Urel)
          - fvm::laplacian(nu, Urel)
          + F//add the source item
        );
        solve(UrelEqn == -fvc::grad(p));
        // --- PISO loop
        for (int corr=0; corr<nCorr; corr++)
        {
            volScalarField rAUrel(1.0/UrelEqn.A());
            Urel = rAUrel*UrelEqn.H();
            phi = (fvc::interpolate(Urel) & mesh.Sf())
                + fvc::ddtPhiCorr(rAUrel, Urel, phi);
            adjustPhi(phi, Urel, p);
            for (int nonOrth=0; nonOrth<=nNonOrthCorr; nonOrth++)
            {
                fvScalarMatrix pEqn
                (
                    fvm::laplacian(rAUrel, p) == fvc::div(phi)
                );
                pEqn.setReference(pRefCell, pRefValue);
                pEqn.solve();
                if (nonOrth == nNonOrthCorr)
                {
                    phi -= pEqn.flux();
                }
            }
            #include "continuityErrs.H"
            Urel -= rAUrel*fvc::grad(p);
            Urel.correctBoundaryConditions();

    //---update absolute velocity
    Ue=Uetmp * sin(omega * t);
    Ue.correctBoundaryConditions();//correct the boundary values
    Uabs = Urel + Ue;
 }
        runTime.write();
        Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
            << "  ClockTime = " << runTime.elapsedClockTime() << " s"
            << nl << endl;
    }
    Info<< "End\n" << endl;
    return 0;
}

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



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