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popezmark July 6, 2011 04:09

rhoPisoFoam & rhoPimpleFoam
Hi everyone!

I've noticed that in the last release of OpenFoam, the 2.0, the rhoPisoFoam is no more. Why is that?

Can be replaced conveniently with the rhoPimpleFoam solver? What's the difference?

Thanks everyone

fabian_roesler July 6, 2011 08:06

Dear popezmark

PISO does only one outer calculation step by calculating U and then correcting p in several corrector steps.
In OF 2.0 the rhoFoam solver uses the PIMPLE algorithm which has better stability when using larger time steps. PIMPLE performs a PISO corrector loop which is repeated several times, starting with the results of the previous corrector step. Thus you are allowed to under relax the solver. The solver is faster and more stabel. Have a look here:

On the pimpleFoam solution algorithm

But you should have a closer look at the threads in this forum. I posted the same answer a few weeks ago. Just search for PIMPLE and you will find the answer without asking.

Regards Fabian

popezmark July 6, 2011 12:35

Thank you very much for your reply and kindness, Fabian :)

I will read the informations you posted, and I'll have a closer look next time ;)


pcaste12 July 15, 2011 05:29


I am currently using OF 1.7.1 and I was wondering if the rhoPimpleFoam works well with this version?


pcaste12 July 15, 2011 05:39

Sorry for the question I found my answer in other post.

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