void Foam::MaxwellianThermal<CloudType>::correct ( typename CloudType::parcelType& p, const wallPolyPatch& wpp ) { vector& U = p.U(); scalar& Ei = p.Ei(); label typeId = p.typeId(); label wppIndex = wpp.index(); label wppLocalFace = wpp.whichFace(p.face()); vector nw = p.normal(); nw /= mag(nw); // 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.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(); scalar iDof = cloud.constProps(typeId).internalDegreesOfFreedom(); U = sqrt(physicoChemical::k.value()*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); }
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; } } }