rhoPisoFoam & rhoPimpleFoam

popezmark · July 6, 2011, 04:09

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

Marco

pcaste12 · July 15, 2011, 05:29

Hi,

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

Thanks,
Pierre.

pcaste12 · July 15, 2011, 05:39

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

July 6, 2011, 04:09	rhoPisoFoam & rhoPimpleFoam	#1
popezmark New Member Marco Popesso Join Date: Jun 2011 Posts: 5 Rep Power: 3	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

July 6, 2011, 08:06	PIMPLE/PISO rhoFoam	#2
fabian_roesler Member Fabian Roesler Join Date: Mar 2009 Location: Bayreuth, Germany Posts: 61 Rep Power: 6	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

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July 6, 2011, 12:35		#3
popezmark New Member Marco Popesso Join Date: Jun 2011 Posts: 5 Rep Power: 3	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 Marco

July 15, 2011, 05:29		#4
pcaste12 Member Pierre Castellani Join Date: Apr 2011 Location: Paris Posts: 38 Rep Power: 4	Hi, I am currently using OF 1.7.1 and I was wondering if the rhoPimpleFoam works well with this version? Thanks, Pierre.

July 15, 2011, 05:39		#5
pcaste12 Member Pierre Castellani Join Date: Apr 2011 Location: Paris Posts: 38 Rep Power: 4	Sorry for the question I found my answer in other post. Thanks.