Issue defining internal flow volume of building

Using SimScale CAD & Meshing
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Hey everyone I am new to SimScale and I am attempting to model the ventilation of the building in the picture. Right now I am working to define an internal flow volume inside the building. I click on one of the inner walls as the seed and then click on the rest of the walls, roof, and floor to set as boundary faces. When I do this I get an error shown in the image.
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I am not on a professional license so it will not let me make it public but if there is another way I can share please let me know. I did share it with support. Right now I am working on a project titled “Trial Run-Baseline”

I imported the model as a native Revit file (.rvt). Should I look into other ways to import the file?

Any help would be greatly appreciated!

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Hi @srk018, thanks for posting on the forum and welcome to the SimScale Community :handshake:

It’s a bit hard to pinpoint exactly where the problem lies without having a closer look at the project (take a look here to know how to post your project’s URL), but here’s some general advice:

  1. Defeature your CAD so that it’s rid of small faces/unnecessary details
  2. Try exporting your CAD as polysurface formats (e.g. STEP/Parasolid)

Also, this article has proven to be very helpful to our users: How to Find Faults in the CAD Model? | SimScale Knowledge Base

Let us know if this helps.

Cheers
Igor