foam-extend4.1-coherent-io/applications/solvers/coupled/pUCoupledFoam/pUCoupledFoam.C

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    This file is part of OpenFOAM.

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Application
    pUCoupledFoam

Description
    Steady-state solver for incompressible, turbulent flow, with implicit
    coupling between pressure and velocity achieved by BlockLduMatrix
    Turbulence is in this version solved using the existing turbulence
    structure.

Authors
    Klas Jareteg, Chalmers University of Technology,
    Vuko Vukcevic, FMENA Zagreb.

\*---------------------------------------------------------------------------*/

#include "fvCFD.H"
#include "singlePhaseTransportModel.H"
#include "RASModel.H"

#include "VectorNFieldTypes.H"
#include "volVectorNFields.H"
#include "blockLduSolvers.H"
#include "blockVectorNMatrices.H"

#include "blockMatrixTools.H"

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

int main(int argc, char *argv[])
{

#   include "setRootCase.H"
#   include "createTime.H"
#   include "createMesh.H"
#   include "createFields.H"
#   include "initContinuityErrs.H"
#   include "readBlockSolverControls.H"

    // Calculate coupling matrices only once since the mesh doesn't change and
    // implicit div and grad operators are only dependant on Sf. Actually
    // coupling terms (div(U) and grad(p)) in blockMatrix do not change, so they
    // could be inserted only once, resetting other parts of blockMatrix to zero
    // at the end of each time step. VV, 30/April/2014
#   include "calculateCouplingMatrices.H"

    Info<< "\nStarting time loop\n" << endl;
    while (runTime.loop())
    {
        Info<< "Time = " << runTime.timeName() << nl << endl;

        p.storePrevIter();

        // Initialize block matrix
#       include "initializeBlockMatrix.H"

        // Assemble and insert momentum equation
#       include "UEqn.H"

        // Assemble and insert pressure equation
#       include "pEqn.H"

        // Insert coupling, updating the boundary contributions
        // Last argument in insertBlockCoupling says if the first location
        // should be incremented. This is needed for arbitrary positioning
        // of U and p in the system. This could be better. VV, 30/April/2014
        blockMatrixTools::insertBlockCoupling(3, 0, UInp, U, A, b, false);
        blockMatrixTools::insertBlockCoupling(0, 3, pInU, p, A, b, true);

        // Solve the block matrix
        BlockSolverPerformance<vector4> solverPerf =
            BlockLduSolver<vector4>::New
            (
                word("Up"),
                A,
                mesh.solutionDict().solver("Up")
            )->solve(Up, b);

        solverPerf.print();

        // Retrieve solution
        blockMatrixTools::retrieveSolution(0, U.internalField(), Up);
        blockMatrixTools::retrieveSolution(3, p.internalField(), Up);

        U.correctBoundaryConditions();
        p.correctBoundaryConditions();

        phi = (fvc::interpolate(U) & mesh.Sf()) + pEqn.flux() + presSource;

#       include "continuityErrs.H"

        p.relax();

        turbulence->correct();
        runTime.write();

        Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
            << "  ClockTime = " << runTime.elapsedClockTime() << " s"
            << nl << endl;
    }

    Info<< "End\n" << endl;

    return 0;
}