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Old   December 26, 2014, 03:29
Question Confused about pEqn
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Hi everyone,

I am currently doing some work on the caveatingFoam. In which the pEqn is as following:

fvScalarMatrix pEqn
            fvm::ddt(psi, p)
          - (rhol0 + (psil - psiv)*pSat)*fvc::ddt(alphav) - pSat*fvc::ddt(psi)
          + fvc::div(phiv, rho)
          + fvc::div(phiGradp)
          - fvm::laplacian(rhorAUf, p)
According to the literature (Phd thesis by Fabian), the pEqn should be
fvm::ddt(psi, p)
          - (rhol0 + (psil - psiv)*pSat)*fvc::ddt(alphav) - pSat*fvc::ddt(psi)
          + fvc::div(phiv, rho)
is you write every term one by one.
so what is the last two terms mean? :
+ fvc::div(phiGradp)
          - fvm::laplacian(rhorAUf, p)
And I am also confused about the last step in pimple loop:
if (pimple.finalNonOrthogonalIter())
            phiv += (phiGradp + pEqn.flux())/rhof;
Can anyone give me some hint here? If they are for numerical reasons, where can I find information for them? I didn't see much about this in CFD books I have read. I assume they are very important as I can find the similar term in many other solvers.

Kind regards and Merry Christmas!

Last edited by xianqiejiao; December 26, 2014 at 08:40.
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Old   February 29, 2016, 09:36
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Hi xianqiejiao,
I hope you would have found answers for this question by now. If so can you please share it in the forum so that it will be useful for people like me who are struggling with similar problems. I appreciate your response

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