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Porous media setup issues in Fluent

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Old   December 3, 2013, 15:53
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  #21
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tryh the following: two zones one fluid one porous with inlet outlet and the wall boundaries do not try to define explicetly the contact. I guess you are working with multibody part (Merge all parts in DM into one) and name the selections in Meshing
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Old   December 9, 2013, 12:56
Default Porous jump error at mesh checking
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Ilyas
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Hi every one,

I had getting error in pororus jump error

Checking boundary types:
Error: jump zone 7 has wrong types of cell zones (cell and cell).

Zone & is comng under in My PEMFC as Inter of anode CC in boundary conditions type as porous jump

I dont know how to rectify it...

Help me solve this
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Old   June 6, 2014, 05:52
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umesh k
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Thanks Bryon for your suggestion,
my problem is from the initial stage. I am simulating the catalytic converter and have modeled in CATIA with two substrate(substrates here act as a porous media where reactions are taken place and have hexagonal cells) inside it. I have simply assembled those two substrates. Now should i mesh the substrate as well as fluid body at a time(if so then the meshing will not be completely done) or separately(if so the substrate will be meshed twice)? OR shall I create only external cover while modeling(meshing as well) and while giving bc's in fluent i shall create a block mention bc's as
porous.
please help me since I am novice in this domain
Regards
Umesh K
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Old   July 20, 2015, 14:49
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mohamadreza
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Hi every body
I don't know how determine initial velocity for the flow in porous media.
Thank you for time and consideration.
Best regards
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Old   July 20, 2015, 20:15
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do you have a mass flow?
In the porous domain definition there is something to define the solid to fluid ratio. So if it was 0.5, your velocity would be twice as if there was no solid domain. In front and after the porous domain you would have to define a fluid domain. If nothing is known, take entrainment inlet and mass flow rate. Then it works out the velocities inside and outside the porosity.
Its just a guess, no idea, what you want to do.

Last edited by Steffen595; July 20, 2015 at 23:50.
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Old   July 24, 2015, 09:10
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Hi Mr.Steffen,

Many thanks for your response.

I want to model the solid porous media with flow in it but there is not any fluid zone In front and after the porous domain. I really appreciate if you tell me how can I set initial velocity for the flow in porous media.
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Old   July 24, 2015, 18:24
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just put a mass flow in instead and it will work out the velocity
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Old   June 7, 2016, 08:21
Default 0 porosity
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johnr
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Hi,
Need urgent help!!

I have set porosity zero in a 3D cell zone inside a pipe, using a UDF. But there is still a flow through the pipe. I have checked the output of the UDF and there is no problem in that...

Don't know what to do now. It is like this-

porosity=0.0 (working fine)
after some time,
porosity=1.0 (working fine)
after some time,
porosity=0.0 (not working)
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