[AlexRonto]

Hi!

I try to do a CHT analysis at FLUENT. I have made a Hex mesh for the fluid zone at ICEM and an unstructured Tet mesh for the solid zone at ANSYS Meshing. Till now I have managed to import the unstructured mesh into ICEM, merge the two meshes into one mesh and export it to Fluent.

The problem is that when defining the boundary conditions at Fluent, I need the interface between fluid-solid zones to be identified as a coupled wall, in order for the heat transfer to take place. However, the interface is identified by Fluent as 2 different walls (fluidside - solidside), so I suppose there is no connection between them. If anyone could give some advice about how to make a proper "interface" between a structured and an unstructured mesh it would be very helpfull.

P.S.: If it wasn't for the structured mesh that I need, I would create ONE part at ANSYS Meshing including both the fluid and solid bodies and the generated mesh would be conformal at the interfaces. I'd like to do the same thing now at ICEM.

[Kushal Puri]

Originally Posted by AlexRonto

Hi!

I try to do a CHT analysis at FLUENT. I have made a Hex mesh for the fluid zone at ICEM and an unstructured Tet mesh for the solid zone at ANSYS Meshing. Till now I have managed to import the unstructured mesh into ICEM, merge the two meshes into one mesh and export it to Fluent.

The problem is that when defining the boundary conditions at Fluent, I need the interface between fluid-solid zones to be identified as a coupled wall, in order for the heat transfer to take place. However, the interface is identified by Fluent as 2 different walls (fluidside - solidside), so I suppose there is no connection between them. If anyone could give some advice about how to make a proper "interface" between a structured and an unstructured mesh it would be very helpfull.

P.S.: If it wasn't for the structured mesh that I need, I would create ONE part at ANSYS Meshing including both the fluid and solid bodies and the generated mesh would be conformal at the interfaces. I'd like to do the same thing now at ICEM.

As you said you are merging the two meshes, it means it is a conformal mesh. it has to be automatically a coupled wall.

But as per your last statement that it is two walls fluid side and solid side, it seems like it is non-conformal mesh. So for non conformal mesh you can follow the following steps to make them as a coupled wall.

1) change the boundary conditions type of both the fluidside and solidside from wall to interface.

2) go to mesh interface give the name of the mesh interface select interface zone 1 and interface zone 2 and turn on the coupled wall option.

Once you press create your different wall will change to coupled wall

[AlexRonto]

Thank you Kushal Puri for your answer,

actually I noticed I didn't understand the "merge" condition. I just imported the unstructured mesh to ICEM by "Merging" instead of "Replacing". I suppose it does not mean that the 2 meshes are merged, and thereby the interface is not conformal.

But I also came to believe that I don't need a conformal mesh for the heat transfer to take place (is that right?). So I will just follow your instructions for defining the two surfaces as coupled wall in FLUENT.

Thnx again!