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Have problem with 2 phase porous media

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Old   October 2, 2013, 11:16
Question Have problem with 2 phase porous media
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Juun
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I am doing a simple filter simulation, shown in the pic.




Phase 2 (particle) will stop and accumulate on the left hand side.



Phase 1 (mixture gas) goes through porous media, wall surface reaction happens at the same time on the porous media.



Problems


1. As there is no ‘wall’, I setup volumetric reaction in porous media, Am I doing this correct?



2. How to simulate particle accumulation?


And the last one problem is that the solver runs ok without multiphase (that is only has mixture gas) … but when I switch it to 2 phases, there is error, saying



Divergence detected in AMG solver: phase-1-species-0
Divergence detected in AMG solver: phase-1-species-1
Divergence detected in AMG solver: phase-1-species-2
Divergence detected in AMG solver: phase-1-species-3
Primitive Error at Node 0: floating point exception
Primitive Error at Node 1: floating point exception
Primitive Error at Node 2: floating point exception
Primitive Error at Node 3: floating point exception


The species fractions settings are the same in both cases (with and without multiphase)


Does anyone have any idea about these problems? Many thanks.
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Old   October 3, 2013, 00:39
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EMAVI V SURYA SAMPATH
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What is your inlet condition ?

Try increasing the pressure relaxation factor and by decreasing the momentum and volume fraction relaxation factor

Divergence in AMG solver is because of URF's .

Did u define porous zone ?

Regards,
Sampath Emani
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Old   October 3, 2013, 07:44
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Juun
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Sampath, Thanks

inlet conditions:
velocity inlet for both phases, at 5 m/s (i chose random number, at this stage),
temperature default setting 300k
mass fraction (picked randomly for this stage)
species 0: 0
species 1: 0.1
species 2: 0.3
species 3: 0.5

phase 2 volume fraction 0.1

yes, I defined a porous zone. Do you mean if I have defined porous zone, particle accumulation will automatically appear?
-----------------------------------------------------
after I reduced some URFs, the error has gone... Thanks

Thanks a lot
Juun
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