void Foam::MixedDiffuseSpecular<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;
CloudType& cloud(this->owner());
Random& rndGen(cloud.rndGen());
if (diffuseFraction_ > rndGen.scalar01())
{
// Diffuse reflection
// Wall tangential velocity (flow direction)
vector Ut = U - U_dot_nw*nw;
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())
);
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.scalarNormal()*tw1
+ rndGen.scalarNormal()*tw2
- sqrt(-2.0*log(max(1 - rndGen.scalar01(), vSmall)))*nw
);
U += cloud.boundaryU().boundaryField()[wppIndex][wppLocalFace];
Ei = cloud.equipartitionInternalEnergy(T, iDof);
}
else
{
// Specular reflection
if (U_dot_nw > 0.0)
{
U -= 2.0*U_dot_nw*nw;
}
}
}
