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-   -   pressure equation in PISO or SIMPLE algorithm (http://www.cfd-online.com/Forums/openfoam/96244-pressure-equation-piso-simple-algorithm.html)

mechy January 17, 2012 05:43

pressure equation in PISO or SIMPLE algorithm
 
Hi all
I have a question about pressure equation in PISO or SIMPLE algorithm please guide me in this problem
pressure equation is
laplacian(rAU, p) == fvc::div(rAU*UEqn.H())
but in OpenFoam rAU*UEqn.H() is interpolated on cell faces
why we do this work ?

Best Regards

sharonyue July 8, 2013 22:36

Quote:

Originally Posted by mechy (Post 339681)
Hi all
I have a question about pressure equation in PISO or SIMPLE algorithm please guide me in this problem
pressure equation is
laplacian(rAU, p) == fvc::div(rAU*UEqn.H())
but in OpenFoam rAU*UEqn.H() is interpolated on cell faces
why we do this work ?

Best Regards

I think just coz its interpolated on the faces, so it can be expressred by the flux.

yhaomin2007 July 22, 2013 14:17

I assume you are looking at incompressible flow solver. "rAU*UEqn.H()" here is actually velocity.
original equation should be "laplacian(rAU, p) == fvc::div(phi) "
phi = fvc::interpolate(U) & mesh.Sf();
U = rAU*UEqn.H()
You should look up Prof. Jasak's thesis, he talked about this in detail in his thesis.


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