limitVelocity.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    Copyright (C) 2016-2017 OpenFOAM Foundation
    Copyright (C) 2018-2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
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    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "limitVelocity.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace fv
{
    defineTypeNameAndDebug(limitVelocity, 0);
    addToRunTimeSelectionTable(option, limitVelocity, dictionary);
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::fv::limitVelocity::limitVelocity
(
    const word& name,
    const word& modelType,
    const dictionary& dict,
    const fvMesh& mesh
)
:
    cellSetOption(name, modelType, dict, mesh),
    UName_(coeffs_.getOrDefault<word>("U", "U")),
    max_(coeffs_.get<scalar>("max"))
{
    fieldNames_.setSize(1, UName_);
    applied_.setSize(1, false);
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
bool Foam::fv::limitVelocity::read(const dictionary& dict)
{
    if (cellSetOption::read(dict))
    {
        coeffs_.readEntry("max", max_);
 
        return true;
    }
 
    return false;
}
 
 
void Foam::fv::limitVelocity::correct(volVectorField& U)
{
    const scalar maxSqrU = sqr(max_);
 
    vectorField& Uif = U.primitiveFieldRef();
 
    for (const label celli : cells_)
    {
        const scalar magSqrUi = magSqr(Uif[celli]);
 
        if (magSqrUi > maxSqrU)
        {
            Uif[celli] *= sqrt(maxSqrU/magSqrUi);
        }
    }
 
    // handle boundaries in the case of 'all'
    if (selectionMode_ == smAll)
    {
        volVectorField::Boundary& Ubf = U.boundaryFieldRef();
 
        forAll(Ubf, patchi)
        {
            fvPatchVectorField& Up = Ubf[patchi];
 
            if (!Up.fixesValue())
            {
                forAll(Up, facei)
                {
                    const scalar magSqrUi = magSqr(Up[facei]);
 
                    if (magSqrUi > maxSqrU)
                    {
                        Up[facei] *= sqrt(maxSqrU/magSqrUi);
                    }
                }
            }
        }
    }
 
    // We've changed internal values so give
    // boundary conditions opportunity to correct
    U.correctBoundaryConditions();
}
 
 
// ************************************************************************* //