nonLinearWallFunctionsI.H

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Global
    nonLinearwallFunctions

Description
    Calculate wall generation and dissipation from wall-functions
    for non-linear models.

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

{
    labelList cellBoundaryFaceCount(epsilon_.size(), 0);

    scalar yPlusLam = this->yPlusLam(kappa_.value(), E_.value());

    const fvPatchList& patches = mesh_.boundary();

    //- Initialise the near-wall G and epsilon fields to zero
    forAll(patches, patchi)
    {
        const fvPatch& curPatch = patches[patchi];

        if (isA<wallFvPatch>(curPatch))
        {
            forAll(curPatch, facei)
            {
                label faceCelli = curPatch.faceCells()[facei];

                epsilon_[faceCelli] = 0.0;
                G[faceCelli] = 0.0;
            }
        }
    }

    //- Accumulate the wall face contributions to epsilon and G
    //  Increment cellBoundaryFaceCount for each face for averaging
    forAll(patches, patchi)
    {
        const fvPatch& curPatch = patches[patchi];

        if (isA<wallFvPatch>(curPatch))
        {
            #include <finiteVolume/checkPatchFieldTypes.H>

            const scalarField& nuw = nu().boundaryField()[patchi];
            const scalarField& nutw = nut_.boundaryField()[patchi];

            scalarField magFaceGradU = mag(U_.boundaryField()[patchi].snGrad());

            forAll(curPatch, facei)
            {
                label faceCelli = curPatch.faceCells()[facei];

                //- using local Cmu !
                scalar Cmu25 = pow(Cmu_[faceCelli], 0.25);
                scalar Cmu75 = pow(Cmu_[faceCelli], 0.75);

                scalar yPlus =
                    Cmu25*y_[patchi][facei]
                    *sqrt(k_[faceCelli])
                    /nuw[facei];

                // For corner cells (with two boundary or more faces),
                // epsilon and G in the near-wall cell are calculated
                // as an average

                cellBoundaryFaceCount[faceCelli]++;

                epsilon_[faceCelli] +=
                     Cmu75*pow(k_[faceCelli], 1.5)
                    /(kappa_.value()*y_[patchi][facei]);

                if (yPlus > yPlusLam)
                {
                    G[faceCelli] +=
                        (nutw[facei] + nuw[facei])
                        *magFaceGradU[facei]
                        *Cmu25*sqrt(k_[faceCelli])
                        /(kappa_.value()*y_[patchi][facei])
                      - (nonlinearStress_[faceCelli] && gradU_[faceCelli]);
                }
            }
        }
    }

    // Perform the averaging

    forAll(patches, patchi)
    {
        const fvPatch& curPatch = patches[patchi];

        if (isA<wallFvPatch>(curPatch))
        {
            forAll(curPatch, facei)
            {
                label faceCelli = curPatch.faceCells()[facei];

                epsilon_[faceCelli] /= cellBoundaryFaceCount[faceCelli];
                G[faceCelli] /= cellBoundaryFaceCount[faceCelli];
            }
        }
    }
}


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