simulating two different gases

achyutan · December 29, 2013, 06:32

Hi,

I would like to know how to simulate two different gases in same domain in compressible flow solver. I use a modified form of rhoCentralFoam.

Domain is a cylindrical pipe with two internal diaphragms. I want to specify gases with different densities in the partitioned regions. I don't think it is a multi-phase flow type. The two fluids do not interact. It is just the transfer of loads that I am looking at.
The gases are modeled by same eqn of state. I just want to change the density.

As I post, I think about another option as to breakup the internalField into two so I can specify different initial densities. I don't know if its possible in openfoam.

suggestions would be sincerely appreciated.

Linse · December 30, 2013, 06:36

Hi Achyutan,

how about using "reactingFoam" and switching off the chemistry solution part?

Cheers,
Bernhard

achyutan · December 31, 2013, 04:11

Hi Bernhard,
Thank u for your response.
I don't have much exp using reactingFoam. Also, I am using godunov type schemes for shock capturing which i guess i cannot use in reactingFoam. Of course, i can modify it to my use.

Now, I want to know if i use splitmeshRegions utility can i specify two different gases ?
if yes, how to do it ?

December 29, 2013, 06:32	simulating two different gases	#1
achyutan Member Join Date: Sep 2012 Posts: 60 Rep Power: 13	Hi, I would like to know how to simulate two different gases in same domain in compressible flow solver. I use a modified form of rhoCentralFoam. Domain is a cylindrical pipe with two internal diaphragms. I want to specify gases with different densities in the partitioned regions. I don't think it is a multi-phase flow type. The two fluids do not interact. It is just the transfer of loads that I am looking at. The gases are modeled by same eqn of state. I just want to change the density. As I post, I think about another option as to breakup the internalField into two so I can specify different initial densities. I don't know if its possible in openfoam. suggestions would be sincerely appreciated.

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December 30, 2013, 06:36		#2
Linse Senior Member Bernhard Linseisen Join Date: May 2010 Location: Heilbronn Posts: 183 Blog Entries: 1 Rep Power: 15	Hi Achyutan, how about using "reactingFoam" and switching off the chemistry solution part? Cheers, Bernhard

December 31, 2013, 04:11		#3
achyutan Member Join Date: Sep 2012 Posts: 60 Rep Power: 13	Hi Bernhard, Thank u for your response. I don't have much exp using reactingFoam. Also, I am using godunov type schemes for shock capturing which i guess i cannot use in reactingFoam. Of course, i can modify it to my use. Now, I want to know if i use splitmeshRegions utility can i specify two different gases ? if yes, how to do it ?