[mattiafc]

Good morning dear foamers,

I am porting a solver from OF4 to OF8. The code I'm using is a modification of the pisoFOAM solver. While doing this, I notice that the solution from pisoFoam in OpenFOAM 4 vs pisoFoam in OpenFOAM 8 (and also OpenFOAM 7) greatly differs in the first few iterations. The velocity magnitude predicted by OF4 is much bigger than the one predicted by OF8. Both setups are identical.
This prologue brings me to ask this question: are you (pisoFoam users) aware of any major difference bewteen pisoFoam implementation in OF4 and OF 8 (or 7)? I already checked the patch notes from the various release but there is nothing in there

Thanks,
Mattia

[mattiafc]

Hi everyone,

There is a substantial difference between OF4,5 and 6 and OF7. Now pisoFoam (and many other solvers) does not need the line

pEqn.solve(mesh.solver(p.select(piso.finalInnerIter())));

to use specific settings for the final nonOrthogonal correction, as that line has been substituted with

pEqn.solve();

and sovlers now are able to automatically handle different fvSolution settings for the final nonOrthogonal correction.

You can find more information here (comparison OF6 - OF7)
https://github.com/OpenFOAM/OpenFOAM...358d352d534f75