MaxwellianThermal.C

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    Copyright (C) 2011-2017 OpenFOAM Foundation
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License
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#include "MaxwellianThermal.H"
#include "constants.H"
 
using namespace Foam::constant;
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::MaxwellianThermal<CloudType>::MaxwellianThermal
(
    const dictionary& dict,
    CloudType& cloud
)
:
    WallInteractionModel<CloudType>(cloud)
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::MaxwellianThermal<CloudType>::~MaxwellianThermal()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class CloudType>
void Foam::MaxwellianThermal<CloudType>::correct
(
    typename CloudType::parcelType& p
)
{
    vector& U = p.U();
 
    scalar& Ei = p.Ei();
 
    label typeId = p.typeId();
 
    const label wppIndex = p.patch();
 
    const polyPatch& wpp = p.mesh().boundaryMesh()[wppIndex];
 
    label wppLocalFace = wpp.whichFace(p.face());
 
    const vector nw = p.normal();
 
    // Normal velocity magnitude
    scalar U_dot_nw = U & nw;
 
    // Wall tangential velocity (flow direction)
    vector Ut = U - U_dot_nw*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.sample01<scalar>()),
            U.y()*(0.8 + 0.2*rndGen.sample01<scalar>()),
            U.z()*(0.8 + 0.2*rndGen.sample01<scalar>())
        );
 
        U_dot_nw = U & nw;
 
        Ut = U - U_dot_nw*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();
 
    direction iDof = cloud.constProps(typeId).internalDegreesOfFreedom();
 
    U =
        sqrt(physicoChemical::k.value()*T/mass)
       *(
            rndGen.GaussNormal<scalar>()*tw1
          + rndGen.GaussNormal<scalar>()*tw2
          - sqrt(-2.0*log(max(1 - rndGen.sample01<scalar>(), VSMALL)))*nw
        );
 
    U += cloud.boundaryU().boundaryField()[wppIndex][wppLocalFace];
 
    Ei = cloud.equipartitionInternalEnergy(T, iDof);
}
 
 
// ************************************************************************* //