Can chtMultiRegionFoam do combustion, radiation and buoyancy?

John1 · August 22, 2015, 16:25

I am a new (unexperienced) OpenFoam user.
I have an unsteady conjugate heat transfer problem to solve.
As far as I could see so far, "chtMultiRegionFoam" is the convenient solver for this purpose.
However, I have additional processes that play a role: combustion, radiation and buoyancy.
Does anybody know, if these processes can also be modelled within chtMultiRegionFoam, and if not, is it possible to create a convenient solver ?

wyldckat · August 22, 2015, 18:28

Quick answer: Radiation and buoyancy is already integrated into "chtMultiRegion*Foam". Combustion isn't integrated into it.

Implementing combustion into "chtMultiRegion*Foam" depends strongly on the type of simulation that you're planning to perform, because there are several types of combustion: http://www.openfoam.org/features/sta...php#TBL-1-55-1

John1 · August 23, 2015, 05:32

Thank you very much indeed for the quick answer. The combustion model does not need to be a sophisticated one, a "simple" model would do. For example Eddy Dissipation Model, where eddy dissipation rate and the Arrhenius rate are compared and the smaller one taken to be rate limiting, based on a two-step or a single-step global reaction mechanism would be sufficient. Could you please give a hint in this direction ?

wyldckat · August 23, 2015, 13:00

Quick answer: I'm not familiar enough with the implemented combustion models in OpenFOAM, so I don't know which one is the most similar to what you're asking. Nonetheless, you can check the source code for each one within the folder that is indicated by this command:

Code:

echo $FOAM_SOLVERS/combustion

As for modifying chtMultiRegionFoam, there is an example here: http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2009/ - search for "Adding electric conduction and Joule heating to chtMultiRegionFoam".

John1 · August 23, 2015, 13:40

Thank you very much. I will check this.

LaszloBarta · January 29, 2016, 12:26

Hi, I am curious, have you made any progress on this topic? I have the same problem to solve. Cheers. Laszlo

August 22, 2015, 16:25	Can chtMultiRegionFoam do combustion, radiation and buoyancy?	#1
John1 New Member Johnny Join Date: Aug 2015 Posts: 3 Rep Power: 11	I am a new (unexperienced) OpenFoam user. I have an unsteady conjugate heat transfer problem to solve. As far as I could see so far, "chtMultiRegionFoam" is the convenient solver for this purpose. However, I have additional processes that play a role: combustion, radiation and buoyancy. Does anybody know, if these processes can also be modelled within chtMultiRegionFoam, and if not, is it possible to create a convenient solver ?

August 23, 2015, 13:00		#4
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,982 Blog Entries: 45 Rep Power: 128	Quick answer: I'm not familiar enough with the implemented combustion models in OpenFOAM, so I don't know which one is the most similar to what you're asking. Nonetheless, you can check the source code for each one within the folder that is indicated by this command: Code: echo $FOAM_SOLVERS/combustion As for modifying chtMultiRegionFoam, there is an example here: http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2009/ - search for "Adding electric conduction and Joule heating to chtMultiRegionFoam".

January 29, 2016, 12:26		#6
LaszloBarta New Member Laszlo Barta Join Date: Nov 2015 Posts: 8 Rep Power: 11	Hi, I am curious, have you made any progress on this topic? I have the same problem to solve. Cheers. Laszlo lmw354 likes this.

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August 22, 2015, 18:28		#2
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,982 Blog Entries: 45 Rep Power: 128	Quick answer: Radiation and buoyancy is already integrated into "chtMultiRegionFoam". Combustion isn't integrated into it. Implementing combustion into "chtMultiRegionFoam" depends strongly on the type of simulation that you're planning to perform, because there are several types of combustion: http://www.openfoam.org/features/sta...php#TBL-1-55-1

August 23, 2015, 05:32		#3
John1 New Member Johnny Join Date: Aug 2015 Posts: 3 Rep Power: 11	Thank you very much indeed for the quick answer. The combustion model does not need to be a sophisticated one, a "simple" model would do. For example Eddy Dissipation Model, where eddy dissipation rate and the Arrhenius rate are compared and the smaller one taken to be rate limiting, based on a two-step or a single-step global reaction mechanism would be sufficient. Could you please give a hint in this direction ?

August 23, 2015, 13:40		#5
John1 New Member Johnny Join Date: Aug 2015 Posts: 3 Rep Power: 11	Thank you very much. I will check this.