[Zaktatir]

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

[ilyas_mufeen03]

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

[umesh k]

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

[mrh111]

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

[Steffen595]

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.

[mrh111]

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.

[Steffen595]

just put a mass flow in instead and it will work out the velocity

[Johnr]

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)

[paolofug87]

Hi guys,
I'm new in using Ansys Fluent, I would like to know how to set a "porous jump" surface. I create two fluid zone and I have properly defined the interface but, in the "boundary conditions", the contact region is defined as "interface" and that is the only option which appears in the drop down menù.
Why I can't set this surface as "porous jump"?
May I need to create a solid surface in the design modeler and make it recognized by ansys as a surface solid zone?
I well understand how to set a porous medium but my goal is to set just a porous jump surface.

Thank you in advance!

[Steffen595]

what do you mean by porous jump? Velocity jumps up when it enters the porous media, you can make a section through it in post.
Porous Jump Boundary
maybe its a 2d thing?