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PEqnflux in compressible and incompressible PISO loop

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Old   October 7, 2008, 10:58
Default Hi, all: I have a question
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roy fokker
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Hi, all:

I have a question about the pEqn.flux() in the PISO loop, for the incompressible(icoFoam) case, after solving the pressure correction equation:

phi -= pEqn.flux();

while in the compressible case (sonicFoam),

phi = pEqn.flux();

My understanding is the incompressible flow is just a special case for the compressible flow (rho=const), no matter the pressure correction equation looks like. Can anyone explain the difference for the two cases?

Thanks a lot!
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