Learning Forum

[DavidB7]

Hello, 

I am trying to model forced flow across a channel partially-filled with porous media in ANSYS FLUENT. when i enable the non-equilibrium model, Fluent creates the porous solid region, fluid porous region and also creates a "wall" boundary condition between the solid porous region and the incoming fluid region.

my question is that what should i do about that "wall" ? because the solid porous region should be able to transfer heat to both the fluid porous region and the incoming fluid region but i don't know how to model that. it is put by default as heat flux=0 which means the solid doesn't transfer heat at all to the incoming fluid region (not realistic).

Thank you!

[Rob]

If you don't do anything with the wall what happens? What does the manual have to say about the model?

[DavidB7]

It says that "this solid zone only interacts with the fluid in the porous region with regard to heat transfer" but this assumption is unrealistic especially for high thermally conductive porous material. So how can I make sure the solid zone also interacts with the rest of my domain? 

Also, do you an idea if I want to actually attach the solid porous zone to another adjacent solid boundary so that conduction heat transfer occurs from that boundary through the solid zone?

Thank you! 

[Karthik Remella]

 Hello,

Make sure you find the walls corresponding to the cell zones you are interested in. Please be careful to select the walls (that should be in contact) of your solid region from the porous zone and its adjacent solid zone. Use the following TUI command to fuse these face zones.

/mesh/modify-zones/fuse-face-zones

This will fuse these two face zones and create an interior zone. Just change the type of this interior zone to wall and Fluent will create the necessary coupled wall for your contact zone.

Please make sure you keep tracking the IDs of the walls involved in this process as they will keep changing with each step. Hope this helps.

Best,

Karthik 

[masoudahmadi]

.

Hello All,

I am trying to solve a similar adsorption problem in which the porous media is placed in the middle of the air channel (after an entrance region) and occupies half of the channel height (2D).

I need to use the non-equilibrium model for the heat transfer but when I activate this model, the bounding walls around the porous zone will be created for the solid portion automatically.

These walls are having zero heat flux boundary conditions which are unrealistic. And I cannot change them to interior type.

I tried fusing the adjacent faces (as suggested above) but because in my problem the connection is between a fluid region (Air outside the porous media) and a solid region (the solid portion of porous media in the non-equilibrium model), the fluent does not seem to allow it ( it just closes the software as I want to fuse those two faces).

I appreciate it if anyone can help me find a solution to this issue.

Best,

Masoud

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[Selawe97]

Hello Did you figure it out?, because is currently facing this and I don't know where should I apply the boundary condition. Thanks

[King666]

Hi,

I have a problem with non-equilibrium porous medium in 2d simulation. I am simulation a channel, only one section of the channel at the middle is porous medium, the remaining parts of free-stream channel. When I select non-equilibrium, the solid mesh is generated and the problem is that two solid walls are generated at the borders of porous zone and normal challen zone. As a result, the channel is blocked! there is no way to change those walls to interior boundary! please help me how can I solve that. I should note that in 3D simulation it doesn't happen, but 2D. 

[Rob]

The walls bound the solid zone, so need to be there. They shouldn't block the flow. Please post some images. 

[King666]

 

Hi Rob, it works, the wall is not blocking thank you