MaxwellianThermal.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2009-2010 OpenCFD Ltd.
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#include "MaxwellianThermal.H"

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

template <class CloudType>
Foam::MaxwellianThermal<CloudType>::MaxwellianThermal
(
    const dictionary& dict,
    CloudType& cloud
)
:
    WallInteractionModel<CloudType>(dict, cloud, typeName)
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

template <class CloudType>
Foam::MaxwellianThermal<CloudType>::~MaxwellianThermal()
{}


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

template <class CloudType>
void Foam::MaxwellianThermal<CloudType>::correct
(
    const wallPolyPatch& wpp,
    const label faceId,
    vector& U,
    scalar& Ei,
    label typeId
)
{
    label wppIndex = wpp.index();

    label wppLocalFace = wpp.whichFace(faceId);

    vector nw = wpp.faceAreas()[wppLocalFace];

    // Normal unit vector
    nw /= mag(nw);

    // Normal velocity magnitude
    scalar magUn = U & nw;

    // Wall tangential velocity (flow direction)
    vector Ut = U - magUn*nw;

    CloudType& cloud(this->owner());

    Random& rndGen(cloud.rndGen());

    while (mag(Ut) < SMALL)
    {
        // If the incident velocity is parallel to the face normal, no
        // tangential direction can be chosen.  Add a perturbation to the
        // incoming velocity and recalculate.

        U = vector
        (
            U.x()*(0.8 + 0.2*rndGen.scalar01()),
            U.y()*(0.8 + 0.2*rndGen.scalar01()),
            U.z()*(0.8 + 0.2*rndGen.scalar01())
        );

        magUn = U & nw;

        Ut = U - magUn*nw;
    }

    // Wall tangential unit vector
    vector tw1 = Ut/mag(Ut);

    // Other tangential unit vector
    vector tw2 = nw^tw1;

    scalar T = cloud.boundaryT().boundaryField()[wppIndex][wppLocalFace];

    scalar mass = cloud.constProps(typeId).mass();

    scalar iDof = cloud.constProps(typeId).internalDegreesOfFreedom();

    U =
        sqrt(CloudType::kb*T/mass)
       *(
            rndGen.GaussNormal()*tw1
          + rndGen.GaussNormal()*tw2
          - sqrt(-2.0*log(max(1 - rndGen.scalar01(), VSMALL)))*nw
        );

    U += cloud.boundaryU().boundaryField()[wppIndex][wppLocalFace];

    Ei = cloud.equipartitionInternalEnergy(T, iDof);
}


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