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BUG: variable 'n' should be incremented in collision loop

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ENH: clean-up of nasty code
This commit is contained in:
andy
2010-09-07 17:14:10 +01:00
parent 5bf4af7914
commit 8d90d3dff6
1 changed files with 26 additions and 20 deletions
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46
src/lagrangian/dieselSpray/spraySubModels/collisionModel/ORourke/sameCell.H
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@ -13,7 +13,8 @@ spray::iterator pMax = p2;
scalar dMin = pMin().d(); scalar dMin = pMin().d();
scalar dMax = pMax().d(); scalar dMax = pMax().d();
if (dMin > dMax) { if (dMin > dMax)
{
dMin = pMax().d(); dMin = pMax().d();
dMax = pMin().d(); dMax = pMin().d();
pMin = p2; pMin = p2;
@ -31,13 +32,14 @@ scalar nMin = pMin().N(rhoMin);
scalar mdMin = mMin/nMin; scalar mdMin = mMin/nMin;
scalar nu0 = 0.25*constant::mathematical::pi*sumD*sumD*magVRel*dt/vols_[cell1]; scalar nu0 = 0.25*constant::mathematical::pi*sqr(sumD)*magVRel*dt/vols_[cell1];
scalar nu = nMin*nu0; scalar nu = nMin*nu0;
scalar collProb = exp(-nu); scalar collProb = exp(-nu);
scalar xx = rndGen_.scalar01(); scalar xx = rndGen_.scalar01();
// collision occur if ((xx > collProb) && (mMin > VSMALL) && (mMax > VSMALL))
if (( xx > collProb) && (mMin > VSMALL) && (mMax > VSMALL)) { {
// collision occurs
scalar gamma = dMax/max(dMin, 1.0e-12); scalar gamma = dMax/max(dMin, 1.0e-12);
scalar f = gamma*gamma*gamma + 2.7*gamma - 2.4*gamma*gamma; scalar f = gamma*gamma*gamma + 2.7*gamma - 2.4*gamma*gamma;
@ -63,8 +65,8 @@ if (( xx > collProb) && (mMin > VSMALL) && (mMax > VSMALL)) {
scalar prob = rndGen_.scalar01(); scalar prob = rndGen_.scalar01();
// Coalescence // Coalescence
if ( prob < coalesceProb && coalescence_) { if (prob < coalesceProb && coalescence_)
{
// How 'many' of the droplets coalesce // How 'many' of the droplets coalesce
// This is the kiva way ... which actually works best // This is the kiva way ... which actually works best
@ -73,14 +75,17 @@ if (( xx > collProb) && (mMin > VSMALL) && (mMax > VSMALL)) {
label n=2; label n=2;
// xx > collProb=zz // xx > collProb=zz
while ((zz < xx) && (n<1000)) { while ((zz < xx) && (n<1000))
{
zz += vnu; zz += vnu;
vnu *= nu/n; vnu *= nu/n;
n++;
} }
//Info<< "vnu = " << vnu << ", n = " << n << endl;
scalar nProb = n - 1; scalar nProb = n - 1;
// All droplets coalesce // All droplets coalesce
if (nProb*nMax > nMin) { if (nProb*nMax > nMin)
{
nProb = nMin/nMax; nProb = nMin/nMax;
} }
@ -93,7 +98,7 @@ if (( xx > collProb) && (mMin > VSMALL) && (mMax > VSMALL)) {
pMax().T() = (averageTemp*mTot - newMinMass*pMin().T())/newMaxMass; pMax().T() = (averageTemp*mTot - newMinMass*pMin().T())/newMaxMass;
rhoMax = spray_.fuels().rho(pc, pMax().T(), pMax().X()); rhoMax = spray_.fuels().rho(pc, pMax().T(), pMax().X());
scalar d3 = pow(dMax, 3) + nProb*pow(dMin,3); scalar d3 = pow3(dMax) + nProb*pow3(dMin);
pMax().d() = cbrt(d3); pMax().d() = cbrt(d3);
pMax().U() = (momMax + (1.0-newMinMass/mMin)*momMin)/newMaxMass; pMax().U() = (momMax + (1.0-newMinMass/mMin)*momMin)/newMaxMass;
@ -110,14 +115,15 @@ if (( xx > collProb) && (mMin > VSMALL) && (mMax > VSMALL)) {
{ {
pMax().X()[i] = Ynew[i]/(spray_.fuels().properties()[i].W()*Wlinv); pMax().X()[i] = Ynew[i]/(spray_.fuels().properties()[i].W()*Wlinv);
} }
} }
// Grazing collision (no coalescence) else
else { {
// Grazing collision (no coalescence)
scalar gf = sqrt(prob) - sqrt(coalesceProb); scalar gf = sqrt(prob) - sqrt(coalesceProb);
scalar denom = 1.0 - sqrt(coalesceProb); scalar denom = 1.0 - sqrt(coalesceProb);
if (denom < 1.0e-5) { if (denom < 1.0e-5)
{
denom = 1.0; denom = 1.0;
} }
gf /= denom; gf /= denom;
@ -139,16 +145,16 @@ if (( xx > collProb) && (mMin > VSMALL) && (mMax > VSMALL)) {
vector v1p = (mr + m2*gf*vRel)/(m1+m2); vector v1p = (mr + m2*gf*vRel)/(m1+m2);
vector v2p = (mr - m1*gf*vRel)/(m1+m2); vector v2p = (mr - m1*gf*vRel)/(m1+m2);
if (n1 < n2) { if (n1 < n2)
{
p1().U() = v1p; p1().U() = v1p;
p2().U() = (n1*v2p + (n2-n1)*v2)/n2; p2().U() = (n1*v2p + (n2-n1)*v2)/n2;
} }
else { else
{
p1().U() = (n2*v1p + (n1-n2)*v1)/n1; p1().U() = (n2*v1p + (n1-n2)*v1)/n1;
p2().U() = v2p; p2().U() = v2p;
} }
}
} // if - coalescence or not }
} // if - collision