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Interface elements for Fluent in HyperMesh.

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When trying to export mesh to cas, an error "*Component names* are assumed to have interface elements and are not included" pops up. 

I need interface elements (overlapping face elements that are not connected) in my cas file for solving in fluent.


How do I export mesh with interface elements.

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I still don't know how to do this directly, but after rolling my head for a really long time, I've adopted a work around.


I've exported each fluid domain (along with face elements under appropriate collectors) as a separate .cas file.


If I place the interface elements under a collector named 'Interface', hypermesh automatically neglects those elements and other wall elements get free 1d's at the ends.


So I had to fool Hypermesh by placing the interface elements under component named 'Wall' and then export the .cas file.


These separate '.cas' files (one for each domain) can now be loaded into fluent by Zone->Append Mesh and change  the boundary conditions of the interface elements from 'Wall' to 'Interface'.


I can't understand why such a simple task as exporting 'Multiple Domains' as a single case file is this tough.

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