Lambda2.C

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    Copyright (C) 2013-2016 OpenFOAM Foundation
    Copyright (C) 2019-2023 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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#include "Lambda2.H"
#include "fvcGrad.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
    defineTypeNameAndDebug(Lambda2, 0);
    addToRunTimeSelectionTable(functionObject, Lambda2, dictionary);
}
}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
bool Foam::functionObjects::Lambda2::calc()
{
    if (foundObject<volVectorField>(fieldName_))
    {
        const volVectorField& U = lookupObject<volVectorField>(fieldName_);
        const tmp<volTensorField> tgradU(fvc::grad(U));
        const volTensorField& gradU = tgradU();
 
        const volSymmTensorField SSplusWW
        (
            symm
            (
                (symm(gradU) & symm(gradU))
              + (skew(gradU) & skew(gradU))
            )
        );
 
        // (JH:p. 76-78)
        return store
        (
            resultName_,
            eigenValues(SSplusWW)().component(vector::Y)
        );
    }
 
    return false;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::functionObjects::Lambda2::Lambda2
(
    const word& name,
    const Time& runTime,
    const dictionary& dict
)
:
    fieldExpression(name, runTime, dict, "U")
{
    setResultName(typeName, "U");
}
 
 
// ************************************************************************* //