automatic interior zone in boundaries is created

  • Last Post 26 February 2019
  • Topic Is Solved
Zari posted this 26 February 2019


I am wondering if there is a way to change an 'interior' zone to a 'fluid' zone?

I have a small 3D mesh, prepared in Fluent meshing (by mosaic technology) and I am running it in Fluent for a CFD model.

It seems that the zones are not defined correctly. Because a new zone-named as interior- (which was not included in the named selections in the geometry and the mesh) being created automatically. It appears as I start Fluent after the meshing. This interior zone includes most of the cells that I want to assign as Fluid! What I want to have is only one fluid domain, with no interior.

I want to assign this interior as active fluid so it can participate in reactions and so on.

Have I made a mistake when I was meshing?

Can I change it in Fluent?

Here is a report from the zones in my model:


Two things are strange: 1- all walls have the material as the species participating it the reaction zone, though they are assigned stationary walls with aluminum as material!

2- The zone 564, is assigned automatically as interior, and I want it to be the same as zone 554, with chemkin-import material.

Where would be my mistakes? and how can I modify it?


Appreciate your help in advance,




abenhadj posted this 26 February 2019

Do not worry about that default interior: it is just referring to the cells of the fluid zones. Ignore it. You will have it always in Fluent. Actually 564 is the referring to the grid forming zone 554.

Best regards,


  • Liked by
  • Zari