chtMultiRegionFoam in of6 Simple Mode

arslanadeel · July 29, 2019, 10:58

Hi

Quick Question

Can anyone one guide me how to run chtMultiRegionFoam in openFoam 6 in steadyState mode, with Simple algorithm.

PS: I have a high velocity so I want to get rid of CFL number.

Thanks

pete20r2 · July 30, 2019, 13:32

What you've done is ask a quick question asking for a long response.
chtMultiRegionFoam uses PIMPLE, you don't get to choose which algorithm is used unless you compile yourself.
You can use steadyState or localEuler time schemes to obtain steady-state solutions with a transient solver.
I'd suggest using localEuler, setting maxCo to 0.5 and setting up residual control.

Owais Shabbir · August 1, 2019, 05:25

Hi,
I am also trying to run steady state. Are there any tutorials involving steady-state? I am using OFv6 and I can't find any steady-state tutorials.

I have few questions regarding chtMultiRegionFoam

Why all the tutorials are using p_rgh as defining the B.C. and then calculating the p?

Please
Thanks

Owais

julieng · February 24, 2021, 16:56

Hello,

What is the reason to have choose the PIMPLE loop to reach steady state?
The old chtMultiRegioSimpleFoam outperforms in term of computation time chtMultiRegionFoam for steady cases.
With high density solid and Co number close to 1 it takes days to reach steady states....
Maybe someone knows how to set up properly the PIMPLE to have same efficiency than SIMPLE?

Julien

July 29, 2019, 10:58	chtMultiRegionFoam in of6 Simple Mode	#1
arslanadeel New Member Arslan Adeel Ur Rehmann Join Date: Jun 2018 Posts: 9 Rep Power: 8	Hi Quick Question Can anyone one guide me how to run chtMultiRegionFoam in openFoam 6 in steadyState mode, with Simple algorithm. PS: I have a high velocity so I want to get rid of CFL number. Thanks

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July 30, 2019, 13:32		#2
pete20r2 Senior Member Peter Baskovich Join Date: Jul 2014 Posts: 127 Rep Power: 12	What you've done is ask a quick question asking for a long response. chtMultiRegionFoam uses PIMPLE, you don't get to choose which algorithm is used unless you compile yourself. You can use steadyState or localEuler time schemes to obtain steady-state solutions with a transient solver. I'd suggest using localEuler, setting maxCo to 0.5 and setting up residual control.

August 1, 2019, 05:25		#3
Owais Shabbir Member Owais Shabbir Join Date: May 2019 Posts: 48 Rep Power: 7	Hi, I am also trying to run steady state. Are there any tutorials involving steady-state? I am using OFv6 and I can't find any steady-state tutorials. I have few questions regarding chtMultiRegionFoam Why all the tutorials are using p_rgh as defining the B.C. and then calculating the p? Please Thanks Owais

February 24, 2021, 16:56		#4
julieng Senior Member julien Join Date: Dec 2018 Posts: 107 Rep Power: 7	Hello, What is the reason to have choose the PIMPLE loop to reach steady state? The old chtMultiRegioSimpleFoam outperforms in term of computation time chtMultiRegionFoam for steady cases. With high density solid and Co number close to 1 it takes days to reach steady states.... Maybe someone knows how to set up properly the PIMPLE to have same efficiency than SIMPLE? Julien