Alternatives for InterFoam - High Viscosity Ratio Problem

saba_saeb · November 13, 2012, 15:30

Hi all,

The problem of InterFoam solver when it comes to two different materials with high viscosity ratio has been already discussed in another topic and is confirmed according to the following (bug) report :

http://www.openfoam.org/mantisbt/view.php?id=156

Now, is there any other solver that can be used instead of InterFoam which doesn't make any problem in this special case?
Your help and suggestions would be much appreciated.

Cheers,
Saba

kmooney · November 13, 2012, 16:05

Have you tried to implement additional PISO iterations or switch to a PIMPLE mode as the mantis report recommends?

saba_saeb · November 13, 2012, 16:12

Hi Kyle,

I tried both approaches suggested in the report, but as it is mentioned, it takes too much time and even worse, the problem doesn't converge at all when the viscosity ratio gets higher, like 10e5!

Cheers,
Saba

kwardle · November 13, 2012, 17:57

Not sure about this, but if you are looking for options you might try multiphaseEulerFoam instead. In that case each phase has it's own momentum equation rather than a shared velocity field as in interFoam. Not sure if this will help or hurt the problem, but it is another thing to try. I would be curious to hear of your results.
-Kent

November 13, 2012, 15:30	Alternatives for InterFoam - High Viscosity Ratio Problem	#1
saba_saeb Member Saba Saeb Join Date: Dec 2010 Location: Erlangen, Germany Posts: 32 Rep Power: 15	Hi all, The problem of InterFoam solver when it comes to two different materials with high viscosity ratio has been already discussed in another topic and is confirmed according to the following (bug) report : http://www.openfoam.org/mantisbt/view.php?id=156 Now, is there any other solver that can be used instead of InterFoam which doesn't make any problem in this special case? Your help and suggestions would be much appreciated. Cheers, Saba

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November 13, 2012, 16:05		#2
kmooney Senior Member Kyle Mooney Join Date: Jul 2009 Location: San Francisco, CA USA Posts: 323 Rep Power: 18	Have you tried to implement additional PISO iterations or switch to a PIMPLE mode as the mantis report recommends?

November 13, 2012, 16:12		#3
saba_saeb Member Saba Saeb Join Date: Dec 2010 Location: Erlangen, Germany Posts: 32 Rep Power: 15	Hi Kyle, I tried both approaches suggested in the report, but as it is mentioned, it takes too much time and even worse, the problem doesn't converge at all when the viscosity ratio gets higher, like 10e5! Cheers, Saba

November 13, 2012, 17:57		#4
kwardle Senior Member Kent Wardle Join Date: Mar 2009 Location: Illinois, USA Posts: 219 Rep Power: 21	Not sure about this, but if you are looking for options you might try multiphaseEulerFoam instead. In that case each phase has it's own momentum equation rather than a shared velocity field as in interFoam. Not sure if this will help or hurt the problem, but it is another thing to try. I would be curious to hear of your results. -Kent