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August 26, 2013, 11:41 
energy equation for porousSimpleFoam

#1 
Member
mohsen kh
Join Date: Jan 2013
Location: Iran
Posts: 88
Rep Power: 6 
Hi dear foamers
I do not know how to add an energy equation to my solver (porousSimpleFoam).my flow is incompressible and I do not know how to add TEqn.H to my own solver.what should I do with (rho of fluid, Cp of it and also Sigma,k and q"') ? while the equation the equation is something like this: rho(fluid)*Cp(fluid)[sigma dt/dt + Udt/dx]=k d2T/dx2 + q'" + (mu/K) u^2 Sigma = [porosity(rho*cp)f+(1porosity)*(rhoc)s]/(rho*cp)f q"' = (1 porosity) q'"s k= (porosity*kf) + (1 porosity)*ks please help me. fvScalarMatrix TEqn ( fvm::ddt(T) +fvm::div(phi,T) fvm::laplacian(alpha,T) ); TEqn.solve(); what should I do with these kf,ks,.... how and where should I define them? Just right them in transportProperties in constant folder? Best regards Mohsen 

August 30, 2013, 23:50 
energy equation for porousSimpleFoam

#2 
Member
mohsen kh
Join Date: Jan 2013
Location: Iran
Posts: 88
Rep Power: 6 
hi dear Foamers
has anyone write this equation for his/her solver? I need emergent help in this case. I understand how to define my porous zone I want to add the energy equation to my solver I did it but didn't work I am here to ask you if you would help me or not I'm looking forward to your reply my friend I hope you can help me by your useful comments my equation is something like this rho(fluid)*Cp(fluid)[sigma dT/dt + UdT/dx]=k d2T/dx2 + q'" + (mu/K) u^2 Sigma = [porosity(rho*cp)f+(1porosity)*(rhoc)s]/(rho*cp)f q"' = (1 porosity) q'"s k= (porosity*kf) + (1 porosity)*ks I also don't know how and where to define sigma,k... best regards Mohsen 

August 31, 2013, 08:04 

#3 
Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 9,648
Blog Entries: 39
Rep Power: 99 
Greetings Mohsen,
Have a look into the solver rhoPorousSimpleFoam. The source code for it is located at "applications/solvers/compressible/rhoSimpleFoam/rhoPorousSimpleFoam/". You can see the full path to it by running: Code:
echo $FOAM_SOLVERS/compressible/rhoSimpleFoam/rhoPorousSimpleFoam/ Or you can modify this equation to work the other way around, namely to solve the temperature and then calculate whatever else is needed. Good luck! Best regards, Bruno
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