CHTMultiRegionFoam

Hr_kules · October 10, 2022, 06:14

Hey, i have a quite generall question regarding the chtMultiRegionFoam solver.
Considering that the chtMultiRegionSimpleFoam solver only exist in older versions, i have worked with a configuration of the solver that uses steady state for ddt schemes.
However the shell and tube heat exchanger example uses PIMPLE options in fvoptions as well as the steady state ddt schemes.
Does this even match, considering that i always assumed the PIMPLE solver as a solver for transient simulations. Does this mean the simulation is done quasi steady state? Considering that the Courant Number affected the results as well as execution time it might makes sense.

However i spent now enough time searching that i consufed myself and would like to discuss with you guys, so that i hopefully one day end up with a true steady state chtMultiRegionFoam simulation.

dlahaye · October 10, 2022, 07:03

Does it help to first verify in which circumstances PIMPLE with a steady-state ddt-scheme reduces to SIMPLE in a fluid-only domain?

Hr_kules · October 10, 2022, 07:16

Hey!

If i start a simulation the log adds these lines:

Code:

PIMPLE: Operating solver in steady-state mode with 1 outer corrector
PIMPLE: Operating solver in SIMPLE mode

Is this what you are referring to? I am just a bit confused to wether i am running a true steady sate simulation or if i have to change the PIMPLE entries in my fvSolution files to SIMPLE entries.

dlahaye · October 10, 2022, 07:32

My reasoning might be too simplistic to be a genuine help to you.

I, however, was imaging running a simpleFOAM tutorial (e.g. Pitz-Daily) using pimpleFOAM and checking in which circumstances the same (or similar) residual convergence history is obtained.

Hr_kules · October 10, 2022, 07:42

Hi,

this is indeed quite a good idea, i will try this

X-Elias · March 6, 2024, 04:34

I also encountered this situation when I set up a hydrogen combustion calculation example. Have you solved this problem?

October 10, 2022, 06:14	CHTMultiRegionFoam	#1
Hr_kules Senior Member Nico Join Date: Jan 2022 Location: Germany Posts: 122 Rep Power: 6	Hey, i have a quite generall question regarding the chtMultiRegionFoam solver. Considering that the chtMultiRegionSimpleFoam solver only exist in older versions, i have worked with a configuration of the solver that uses steady state for ddt schemes. However the shell and tube heat exchanger example uses PIMPLE options in fvoptions as well as the steady state ddt schemes. Does this even match, considering that i always assumed the PIMPLE solver as a solver for transient simulations. Does this mean the simulation is done quasi steady state? Considering that the Courant Number affected the results as well as execution time it might makes sense. However i spent now enough time searching that i consufed myself and would like to discuss with you guys, so that i hopefully one day end up with a true steady state chtMultiRegionFoam simulation.

October 10, 2022, 07:16		#3
Hr_kules Senior Member Nico Join Date: Jan 2022 Location: Germany Posts: 122 Rep Power: 6	Hey! If i start a simulation the log adds these lines: Code: PIMPLE: Operating solver in steady-state mode with 1 outer corrector PIMPLE: Operating solver in SIMPLE mode Is this what you are referring to? I am just a bit confused to wether i am running a true steady sate simulation or if i have to change the PIMPLE entries in my fvSolution files to SIMPLE entries. dlahaye likes this.

October 10, 2022, 07:32		#4
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 802 Blog Entries: 1 Rep Power: 18	My reasoning might be too simplistic to be a genuine help to you. I, however, was imaging running a simpleFOAM tutorial (e.g. Pitz-Daily) using pimpleFOAM and checking in which circumstances the same (or similar) residual convergence history is obtained. Hr_kules likes this.

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October 10, 2022, 07:03		#2
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 802 Blog Entries: 1 Rep Power: 18	Does it help to first verify in which circumstances PIMPLE with a steady-state ddt-scheme reduces to SIMPLE in a fluid-only domain?

October 10, 2022, 07:42		#5
Hr_kules Senior Member Nico Join Date: Jan 2022 Location: Germany Posts: 122 Rep Power: 6	Hi, this is indeed quite a good idea, i will try this

March 6, 2024, 04:34		#6
X-Elias New Member Elias Join Date: Mar 2024 Posts: 1 Rep Power: 0	I also encountered this situation when I set up a hydrogen combustion calculation example. Have you solved this problem?