OpenFOAM-4.x/applications/utilities/postProcessing/wall/wallShearStress/wallShearStress.C

/*---------------------------------------------------------------------------*\
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License
    This file is part of OpenFOAM.

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Application
    wallShearStress

Description
    Calculates and reports the turbulent wall shear stress for all patches,
    for the specified times.

    Compressible modes is automatically selected based on the existence of the
    "thermophysicalProperties" dictionary required to construct the
    thermodynamics package.

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

#include "fvCFD.H"
#include "turbulentTransportModel.H"
#include "turbulentFluidThermoModel.H"
#include "incompressible/singlePhaseTransportModel/singlePhaseTransportModel.H"

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

void calcIncompressible
(
    const fvMesh& mesh,
    const Time& runTime,
    const volVectorField& U,
    volVectorField& wallShearStress
)
{
    #include "createPhi.H"

    singlePhaseTransportModel laminarTransport(U, phi);

    autoPtr<incompressible::turbulenceModel> model
    (
        incompressible::turbulenceModel::New(U, phi, laminarTransport)
    );

    const volSymmTensorField Reff(model->devReff());

    forAll(wallShearStress.boundaryField(), patchI)
    {
        wallShearStress.boundaryField()[patchI] =
        (
           -mesh.Sf().boundaryField()[patchI]
           /mesh.magSf().boundaryField()[patchI]
        ) & Reff.boundaryField()[patchI];
    }
}


void calcCompressible
(
    const fvMesh& mesh,
    const Time& runTime,
    const volVectorField& U,
    volVectorField& wallShearStress
)
{
    IOobject rhoHeader
    (
        "rho",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::NO_WRITE
    );

    if (!rhoHeader.headerOk())
    {
        Info<< "    no rho field" << endl;
        return;
    }

    Info<< "Reading field rho\n" << endl;
    volScalarField rho(rhoHeader, mesh);

    #include "compressibleCreatePhi.H"

    autoPtr<fluidThermo> pThermo(fluidThermo::New(mesh));
    fluidThermo& thermo = pThermo();

    autoPtr<compressible::turbulenceModel> model
    (
        compressible::turbulenceModel::New(rho, U, phi, thermo)
    );

    const volSymmTensorField Reff(model->devRhoReff());

    forAll(wallShearStress.boundaryField(), patchI)
    {
        wallShearStress.boundaryField()[patchI] =
        (
           -mesh.Sf().boundaryField()[patchI]
           /mesh.magSf().boundaryField()[patchI]
        ) & Reff.boundaryField()[patchI];
    }
}


int main(int argc, char *argv[])
{
    timeSelector::addOptions();
    #include "addRegionOption.H"
    #include "setRootCase.H"
    #include "createTime.H"
    instantList timeDirs = timeSelector::select0(runTime, args);
    #include "createNamedMesh.H"

    forAll(timeDirs, timeI)
    {
        runTime.setTime(timeDirs[timeI], timeI);
        Info<< "Time = " << runTime.timeName() << endl;
        mesh.readUpdate();

        volVectorField wallShearStress
        (
            IOobject
            (
                "wallShearStress",
                runTime.timeName(),
                mesh,
                IOobject::NO_READ,
                IOobject::AUTO_WRITE
            ),
            mesh,
            dimensionedVector
            (
                "wallShearStress",
                sqr(dimLength)/sqr(dimTime),
                vector::zero
            )
        );

        IOobject UHeader
        (
            "U",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::NO_WRITE
        );

        if (UHeader.headerOk())
        {
            Info<< "Reading field U\n" << endl;
            volVectorField U(UHeader, mesh);

            if
            (
                IOobject
                (
                    basicThermo::dictName,
                    runTime.constant(),
                    mesh
                ).headerOk()
            )
            {
                calcCompressible(mesh, runTime, U, wallShearStress);
            }
            else
            {
                calcIncompressible(mesh, runTime, U, wallShearStress);
            }
        }
        else
        {
            Info<< "    no U field" << endl;
        }

        Info<< "Writing wall shear stress to field " << wallShearStress.name()
            << nl << endl;

        wallShearStress.write();
    }

    Info<< "End" << endl;

    return 0;
}


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