Problem when adding temperature to interFoam
I tried to apply temperature calculation to interFoam according to the hot thread:
And what I did was exactly same with the author "ovie" wrote in the #14 reply to the above thread.
Everything compiled well, however when I run it on a two-phase flow case, temperature results near interface was higher than heat source temperature which is surely not reliable result.
Also I test the modified solver to solve for single phase heat transfer calculation, although I didnot do precise validation, temperature field seems to be reasonable. Thus I think the main problem here lies in the interface.
On the other hand, from a theoretical view, no matter interface properties(cp, Pr...) is linear interpolated or harmonic interpolated, interface temperature should be no higher than phase temperature surrounding it.
I cant figure out what is the reason for this problem, plz help!
(Also I am trying to debug it by output cp and other properties on the fly, but I am not sure how to do it elegantly, directly to the console or paraView, plz help ...)
I read the thread post by "ovie" again, and I do find that move the Cp to RHS (i.e., now the TEqn becomes:
+ fvm::div(rhoPhi, T)
- fvm::laplacian((kappa/Cp), T)
)help the convergence. But from a theoretical view, I believe it's mathematically equal.
So I got even more confused, I think there must be sth. I misunderstood/didn't understood in the whole process.
:), i guess it returns to the sensitivity of numerical procedure to calculation of convection terms (flux), those are mathematical the same on the whole domain except at interface :D but at interface they are a little different, and it can be accepted a new model :D
Basically I have only read Patankar and Versteeg's book on cfd and both these books didn't focus much on detailed numerical scheme.
(Another newbie question: I want to output Cp in order to see the space distribution of it(just like T and alpha), how can I do it? plz help!)
if you want to see Cp
just define a volScalarField like T :) in "creatFields.H"
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