How to prevent multi-component reacting porous media from movement

BrainDebugger · May 25, 2017, 07:35

Hi all,

I am solving problem of multi-component porous solid media combustion in multi-component gas media. Porous media should have zero velocity under any circumstances. Only physical and chemical processes can change volume fraction of it.

I have following problems with it:
1) Gas flow transfer velocity to porous media making it move (it should not happen) even if I set drag coefficient to zero. May be there are other forces those have to be supressed for movement prevention.
2) Every phase have their own temperature and velocity. I need only one velocity vector and temperature for all gas phases and one for all porous phases. Homogeneous option solves problem partially.

Thanks in advance.

ghorrocks · May 25, 2017, 20:41

1) How are you modelling the porous material? If you used the porous material model to model it (which would appear the obvious choice) then it would never move.

2) Your description says this is a multi-component flow, but you are talking about a multi-phase simulation here. This sounds like a multi-component simulation, not a multi-phase one. You are using the wrong physical model.

So adding these two comments together:
It appears you are modelling the porous material as a phase, and the components as different phases. Try modelling the porous material with a porous material model and the gas with a multi-component model. Then you will not need a multiphase model at all, and this simulation will be MUCH easier.

May 25, 2017, 07:35	How to prevent multi-component reacting porous media from movement	#1
BrainDebugger New Member Join Date: Jul 2013 Posts: 3 Rep Power: 12	Hi all, I am solving problem of multi-component porous solid media combustion in multi-component gas media. Porous media should have zero velocity under any circumstances. Only physical and chemical processes can change volume fraction of it. I have following problems with it: 1) Gas flow transfer velocity to porous media making it move (it should not happen) even if I set drag coefficient to zero. May be there are other forces those have to be supressed for movement prevention. 2) Every phase have their own temperature and velocity. I need only one velocity vector and temperature for all gas phases and one for all porous phases. Homogeneous option solves problem partially. Thanks in advance.

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May 25, 2017, 20:41		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	1) How are you modelling the porous material? If you used the porous material model to model it (which would appear the obvious choice) then it would never move. 2) Your description says this is a multi-component flow, but you are talking about a multi-phase simulation here. This sounds like a multi-component simulation, not a multi-phase one. You are using the wrong physical model. So adding these two comments together: It appears you are modelling the porous material as a phase, and the components as different phases. Try modelling the porous material with a porous material model and the gas with a multi-component model. Then you will not need a multiphase model at all, and this simulation will be MUCH easier.