Program Listing for File ODEWallModelFvPatchScalarField.C

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

    libWallModelledLES is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    libWallModelledLES is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with libWallModelledLES.
    If not, see <http://www.gnu.org/licenses/>.

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

#include "ODEWallModelFvPatchScalarField.H"
#include "addToRunTimeSelectionTable.H"
#include "codeRules.H"
#include "scalarListIOList.H"
#include "helpers.H"
#include "AdaptiveIntegrator.hpp"
#include <functional>

typedef std::function<Foam::scalar(const Foam::scalar)> IntegrandFunc;

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

#if !defined(DOXYGEN_SHOULD_SKIP_THIS)
namespace Foam
{
    defineTypeNameAndDebug(ODEWallModelFvPatchScalarField, 0);
}
#endif


// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //

void Foam::ODEWallModelFvPatchScalarField::writeLocalEntries(Ostream& os) const
{
    wallModelFvPatchScalarField::writeLocalEntries(os);
    eddyViscosity_->write(os);
    sampler_->write(os);
    os.writeKeyword("eps") << eps_ << token::END_STATEMENT << endl;
    os.writeKeyword("maxIter") << maxIter_ << token::END_STATEMENT << endl;
}


Foam::tmp<Foam::scalarField>
Foam::ODEWallModelFvPatchScalarField::calcNut() const
{
    if (debug)
    {
        Info<< "Updating nut for patch " << patch().name() << nl;
    }



    const label patchi = patch().index();

    tmp<scalarField> nuw = this->nu(patchi);

    const scalarListIOList & wallGradU =
        sampler_->db().lookupObject<scalarListIOList>("wallGradU");

    scalarField magGradU(Helpers::mag(wallGradU));

    return max
    (
        scalar(0),
        sqr(calcUTau(magGradU))/(magGradU + ROOTVSMALL) - nuw
    );
}


Foam::tmp<Foam::scalarField>
Foam::ODEWallModelFvPatchScalarField::
calcUTau(const scalarField & magGradU) const
{

    const label patchi = patch().index();
    const label patchSize = patch().size();

    // Grab global uTau field
    volScalarField & uTauField =
        const_cast<volScalarField &>
        (
            db().lookupObject<volScalarField>("uTauPredicted")
        );

    const scalarField & uTauFieldBoundary = uTauField.boundaryFieldRef()[patchi];

    tmp<scalarField> tnuw = this->nu(patchi);
    const scalarField& nuw = tnuw();

    // vectorField for storing the source term
    vectorField sourceField(patchSize, vector(0, 0, 0));

    // Compute the source term
    source(sourceField);

    const scalarListIOList & U = sampler().db().lookupObject<scalarListIOList>("U");
    scalarField magU(patch().size());

    forAll(magU, i)
    {
        magU[i] = mag(vector(U[i][0], U[i][1], U[i][2]));
    }

    // Turbulent viscosity
    const scalarField & nutw = *this;

    // Computed friction velocity
    tmp<scalarField> tuTau(new scalarField(patchSize, 0.0));

    scalarField & uTau = tuTau.ref();

    AdaptiveIntegrator<scalar (scalar)> quad;

    // Compute uTau for each face
    forAll(uTau, faceI)
    {
        // Starting guess using resolved wall gradient or last timestep
        scalar tau = 0;
        if (uTauFieldBoundary[faceI] > 0)
        {
            tau = sqr(uTauFieldBoundary[faceI]);
        }
        else
        {
            tau = (nutw[faceI] + nuw[faceI]) * magGradU[faceI];
        }

        for (int iterI=0; iterI<maxIter_; iterI++)
        {

            IntegrandFunc eddyViscosity =
                eddyViscosity_->value(sampler(), faceI, sqrt(tau), nuw[faceI]);

            scalar nuwI = nuw[faceI];

            IntegrandFunc integrand1 = [eddyViscosity, nuwI](const scalar y){
                return 1.0/(nuwI + eddyViscosity(y));
            };

            IntegrandFunc integrand2 = [eddyViscosity, nuwI](const scalar y){
                return y/(nuwI + eddyViscosity(y));
            };

            scalar integral1 =
                quad.integrate(integrand1, 0.0, sampler().h()[faceI], 1e-6);
            scalar integral2 =
                quad.integrate(integrand2, 0.0, sampler().h()[faceI], 1e-6);

            vector UFaceI(U[faceI][0], U[faceI][1], U[faceI][2]);

            scalar newTau =
                    sqr(magU[faceI]) + sqr(mag(sourceField[faceI])*integral2) -
                    2*(UFaceI & sourceField[faceI])*integral2;

            newTau  = sqrt(newTau)/(integral1 + VSMALL);

            scalar error = mag(tau - newTau)/(mag(tau) + ROOTVSMALL);

            tau = newTau;
            uTau[faceI] = sqrt(max(tau, scalar(0)));

            if (error < eps())
            {
                break;
            }

            if (iterI == maxIter_-1)
            {
                WarningIn
                (
                    "Foam::ODEWallModelFvPatchScalarField::calcUTau()"
                )
                    << "tau_w did not converge to desired tolerance "
                    << eps_ << ". Error value: " << error << nl;
            }
        }

    }

    // Assign computed uTau to the boundary field of the global field
    uTauField.boundaryFieldRef()[patch().index()] == uTau;

    return tuTau;
}

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::ODEWallModelFvPatchScalarField::
ODEWallModelFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    wallModelFvPatchScalarField(p, iF),
    sampler_(nullptr),
    maxIter_(10),
    eps_(1e-3)
{

    if (debug)
    {
        Info<< "Constructing ODEWallModelfvPatchScalarField (o1) "
            << "from copy and DimensionedField for patch " << patch().name()
            << nl;
    }
}

Foam::ODEWallModelFvPatchScalarField::
ODEWallModelFvPatchScalarField
(
    const ODEWallModelFvPatchScalarField& orig,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    wallModelFvPatchScalarField(orig, p, iF, mapper),
#ifdef FOAM_AUTOPTR_HAS_CLONE_METHOD
    eddyViscosity_(orig.eddyViscosity_.clone()),
#else
    eddyViscosity_(orig.eddyViscosity_, false),
#endif
    sampler_(new SingleCellSampler(orig.sampler())),
    maxIter_(orig.maxIter_),
    eps_(orig.eps_)
{
    if (debug)
    {
        Info<< "Constructing ODEWallModelfvPatchScalarField (o2) "
            << "from copy and DimensionedField for patch " << patch().name()
            << nl;
    }

    eddyViscosity_->addFieldsToSampler(sampler());
}


Foam::ODEWallModelFvPatchScalarField::
ODEWallModelFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    wallModelFvPatchScalarField(p, iF, dict),
    eddyViscosity_(EddyViscosity::New(dict.subDict("EddyViscosity"))),
    sampler_
    (
        new SingleCellSampler
        (
            p,
            averagingTime(),
            dict.lookupOrDefault<word>("interpolationType", "cell"),
            dict.lookupOrDefault<word>("sampler", "Tree"),
            dict.lookupOrDefault<word>
            (
                "lengthScale",
                dict.lookupOrDefault<word>("lengthScaleType", "CubeRootVol")
            ),
            dict.lookupOrDefault<bool>("hIsIndex", false)
        )
    ),
    maxIter_(dict.lookupOrDefault<label>("maxIter", 10)),
    eps_(dict.lookupOrDefault<scalar>("eps", 1e-3))

{
    if (debug)
    {
        Info<< "Constructing ODEWallModelfvPatchScalarField (o3) "
            << "from copy and DimensionedField for patch " << patch().name()
            << nl;
    }

    eddyViscosity_->addFieldsToSampler(sampler());
}


#ifdef FOAM_FVPATCHFIELD_NO_COPY
#else
Foam::ODEWallModelFvPatchScalarField::
ODEWallModelFvPatchScalarField
(
    const ODEWallModelFvPatchScalarField& orig
)
:
    wallModelFvPatchScalarField(orig),
#ifdef FOAM_AUTOPTR_HAS_CLONE_METHOD
    eddyViscosity_(orig.eddyViscosity_.clone()),
#else
    eddyViscosity_(orig.eddyViscosity_, false),
#endif
    sampler_(new SingleCellSampler(orig.sampler())),
    maxIter_(orig.maxIter_),
    eps_(orig.eps_)
{

    if (debug)
    {
        Info<< "Constructing ODEWallModelfvPatchScalarField (o4) "
            << "from copy and DimensionedField for patch " << patch().name()
            << nl;
    }
    eddyViscosity_->addFieldsToSampler(sampler());
}
#endif


Foam::ODEWallModelFvPatchScalarField::
ODEWallModelFvPatchScalarField
(
    const ODEWallModelFvPatchScalarField& orig,
    const DimensionedField<scalar, volMesh>& iF
)
:
    wallModelFvPatchScalarField(orig, iF),
#ifdef FOAM_AUTOPTR_HAS_CLONE_METHOD
    eddyViscosity_(orig.eddyViscosity_.clone()),
#else
    eddyViscosity_(orig.eddyViscosity_, false),
#endif
    sampler_(new SingleCellSampler(orig.sampler_())),
    maxIter_(orig.maxIter_),
    eps_(orig.eps_)
{

    if (debug)
    {
        Info<< "Constructing ODEWallModelfvPatchScalarField (o5) "
            << "from copy and DimensionedField for patch " << patch().name()
            << nl;
    }
    eddyViscosity_->addFieldsToSampler(sampler());
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void Foam::ODEWallModelFvPatchScalarField::write(Ostream& os) const
{
    wallModelFvPatchScalarField::write(os);
}


void Foam::ODEWallModelFvPatchScalarField::updateCoeffs()
{
    if (updated())
    {
        return;
    }


    sampler().recomputeFields();
    sampler().sample();

    wallModelFvPatchScalarField::updateCoeffs();
}

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