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ThermoParcel: Improved numerical stability of heat transfer term

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Patch contributed by Timo Niemi, VTT.
Resolves bug-report https://bugs.openfoam.org/view.php?id=2655
This commit is contained in:
Will Bainbridge
2017-08-07 17:58:07 +01:00
committed by Andrew Heather
parent 0a97c3fc95
commit c0bc17ea50
1 changed files with 2 additions and 3 deletions
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5
src/lagrangian/intermediate/parcels/Templates/ThermoParcel/ThermoParcel.C
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@ -282,7 +282,8 @@ Foam::scalar Foam::ThermoParcel<ParcelType>::calcHeatTransfer
const scalar As = this->areaS(d); const scalar As = this->areaS(d);
scalar ap = Tc_ + Sh/(As*htc); scalar ap = Tc_ + Sh/(As*htc);
scalar bp = 6.0*(Sh/As + htc*(Tc_ - T_)); const scalar bp = 6.0*htc/max(rho*d*Cp_, ROOTVSMALL);
if (td.cloud().radiation()) if (td.cloud().radiation())
{ {
tetIndices tetIs = this->currentTetIndices(); tetIndices tetIs = this->currentTetIndices();
@ -294,9 +295,7 @@ Foam::scalar Foam::ThermoParcel<ParcelType>::calcHeatTransfer
scalar s = epsilon*(Gc/4.0 - sigma*pow4(T_)); scalar s = epsilon*(Gc/4.0 - sigma*pow4(T_));
ap += s/htc; ap += s/htc;
bp += 6.0*s;
} }
bp /= rho*d*Cp_*(ap - T_) + ROOTVSMALL;
// Integrate to find the new parcel temperature // Integrate to find the new parcel temperature
IntegrationScheme<scalar>::integrationResult Tres = IntegrationScheme<scalar>::integrationResult Tres =