Troubles with the geometry

Using SimScale CAD & Meshing
1

Hi everyone,

I’m new to CFD and recently started working on a wind tunnel simulation in SimScale. I created my geometry in Blender and exported it as an STL file. However, I’ve been facing issues:

  1. The original STL file wouldn’t run in SimScale, so I tried adding a boolean union operator in Blender to fix it.

  2. After that, I wasn’t able to use the subtract operator in SimScale to define the wind tunnel.

I know the problem has to do with my STL geometry, but I’m not sure what exactly is wrong and what I need to do to fix it.

Since I’m new to CFD and 3D modelling, I might not use all the terms correctly and the problems might seem basic, but I’d appreciate any guidance you can provide.

here is the link to my project

2

Hi @700013893, thanks for posting on the forum and welcome to the SimScale Community :handshake:

We usually advise users not to export their CAD models in an STL format. Since the geometry is faceted, SimScale will by default perform facet splittings in order to convert these many surfaces into merged ones. However, this workflow is not ideal as many times faces will be left off from the operation.

For more information on facet splitting, take a look here:

Could you try and export your model as Parasolid or STEP instead?

Cheers
Igor

3

I just switched to modelling on CAD software instead of blender

Thanks for your support!