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PEqnflux in compressible and incompressible PISO loop |
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October 7, 2008, 11:58 |
Hi, all:
I have a question
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#1 |
Member
roy fokker
Join Date: Mar 2009
Posts: 44
Rep Power: 17 |
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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July 11, 2015, 16:21 |
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#2 |
New Member
België/Belgique
Join Date: Jul 2015
Posts: 3
Rep Power: 11 |
Hi Roy,
Did you eventually found your answer? Because I have the same question you have/had. Thank you! |
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September 27, 2019, 02:14 |
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#3 |
Senior Member
Ashwani
Join Date: Sep 2013
Location: Hyderabad
Posts: 154
Rep Power: 13 |
Did it get resolved? Because I do not see anywhere else in OpenFOAM except in the sonicFOAM this term
phi = pEqn.flux(); without any addition or subtraction. Is it right? Last edited by AshwaniAssam; September 27, 2019 at 02:15. Reason: Typos correction |
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September 27, 2019, 07:13 |
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#4 |
Senior Member
Ashwani
Join Date: Sep 2013
Location: Hyderabad
Posts: 154
Rep Power: 13 |
I found the answer here: PISO Details
In sonicFoam the ".flux()" function returns the influence of all implicit terms on the flux. In this case everything is implicit, so you can assign it like that phi = pEqn.flux(); So, what I understand is that .flux() operator gives the flux terms of the equation which are handled implicitly. |
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