[A CFD free user]

Hi to all,

I am working on a multiphase model in OpenFoam with two regions i.e., one porous media and the other is fluid.

I am wondering which boundary condition I need to apply for the interface, so I would be able to define contact angle for the permeable wall (interface) and also let the species go through it (permeable wall)?


Please, see the brief schematic below

Thanks,
Abouzar


------------------------------
region 1: gas mixture+ liquid water droplets

------------------------------ permeable wall, I need contact angle here!

region 2: porous media, with porosity, K

------------------------------

[ankur_garg]

Hi,


I don't have any experience in Multiphase flow. But I have worked on interface boundary condition. I wanted to ask if you are able to create an interface first and how did you go for it?

[A CFD free user]

Thanks for the response Ankur.
Actually as far as I know, porous media in OpenFoam can be modeled either by defining a porous zone or a porous jump wall. The porous zone properties can be specified either manually through source term or if I am not mistaken, porousInterFoam may be applied. The point is if it is possible to set wettability (contact angle) on the interface or not. I know that it is possible in Fluent but not sure with OpenFoam. Also, is porous jump wall permeable to species transport, say gas mixture?

[ankur_garg]

Welcome! I just know to model porous media using porous zone not through porous jump wall!

"The porous zone properties can be specified either manually through source term or if I am not mistaken, porousInterFoam may be applied."
Yes, You are Right! I would like to add that porosityProperties can be defined inside constant folder.

Now, Are you able to create interface in your geometry?

[A CFD free user]

Originally Posted by ankur_garg

Welcome! I just know to model porous media using porous zone not through porous jump wall!

"The porous zone properties can be specified either manually through source term or if I am not mistaken, porousInterFoam may be applied."
Yes, You are Right! I would like to add that porosityProperties can be defined inside constant folder.

Now, Are you able to create interface in your geometry?

I have not tried it yet since depending on the type of the porous media (zone or wall jump), the required mesh would be different. At present, I am trying to get some insights of modeling porous media in OpenFoam. As I told, the only thing is still ambiguous is the possibility of defining contact angle on the interface between fluid and porous zone either by porous media or jump wall.

Have you tried that before, i.e., imposing a contact angle on porous surface?

[ankur_garg]

I am Sorry, but I have never tried this before (imposing a contact angle on porous surface). But I will ask you to try first creating an interface depending upon any kind of porous problem, then you can think about modeling the porous media. I hope that will be easier, because you will achieve at least first step towards your problem.