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XiFoam enthalpy equation in partially premixed case |
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May 21, 2015, 11:14 |
XiFoam enthalpy equation in partially premixed case
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Guilherme Sempionato
Join Date: Aug 2011
Posts: 12
Rep Power: 14 |
Hi all,
I am researching now the possible XiFoam implementation to a partially pre-mixed combustion case but there are some terms in enthalpy equation that are puzzling me. There is a annotated possible solution in EauEqn.H but I could not encounter a specific paper to detail this solution to a secure implementation. if (ign.ignited()) { volScalarField& heau = thermo.heu(); fvScalarMatrix heauEqn ( fvm::ddt(rho, heau) + mvConvection->fvmDiv(phi, heau) + (fvc::ddt(rho, K) + fvc::div(phi, K))*rho/thermo.rhou() + ( heau.name() == "eau" ? fvc::div ( fvc::absolute(phi/fvc::interpolate(rho), U), p, "div(phiv,p)" )*rho/thermo.rhou() : -dpdt*rho/thermo.rhou() ) - fvm::laplacian(turbulence->alphaEff(), heau) // These terms cannot be used in partially-premixed combustion due to // the resultant inconsistency between ft and heau transport. // A possible solution would be to solve for ftu as well as ft. //- fvm::div(muEff*fvc::grad(b)/(b + 0.001), heau) //+ fvm::Sp(fvc::div(muEff*fvc::grad(b)/(b + 0.001)), heau) == fvOptions(rho, heau) ); fvOptions.constrain(heauEqn); heauEqn.solve(); fvOptions.correct(heau); } The temperature field is presenting some discrepancies in partially premixed cases and I think that is due this terms. Does someone knows more about this commented possible solution? Thanks, Guilherme Sempionato. Last edited by sempionato; May 21, 2015 at 14:18. |
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