Unable to mesh due to overlapping entities

Project Support
1

Dear Support,

I’m currently trying to do a conjugate Heat Transfer Analysis on an incubator designed to hold Petri dishes. It is a closed internal flow system - meaning air recirculates. To model this, I tried using “Advanced Concepts > momentum source”. In reality, there are two centrifugal fans, however I modeled these as geometries resembling the fan + outlet. These are mase slightly smaller than the actual “pipe” / flowregion in that area to avoid overlapping faces. The two geometries are also added to “excluded parts” when making the internal flow volume and are not assigned any material. I still get an error when meshing telling me:
“Conformal meshing cannot be generated with overlapping entities: Front Fan Momentum Source, Rear Fan Momentum source, Flow region. Please perform an interference check with your CAD tool and resolve them by subtracting or moving intersecting parts before importing the model again. Learn more.”

What am I doing wrong?
Thanks in advance! Kindest regards,

Gustav

3

Hi,

Momentum sources must be defined as cell zones. Make sure to have a look at this documentation page: Cell zones

4

Hi Ricardo,

Thanks for your help - that worked. Somehow Physics based meshing got turned off when starting the mesh. I fixed that part, but now when I try to mesh I get the error, that the mesh is too fine?
The following mesh operation(s) failed:

  • Mesh 1

    • The mesh could not be generated as the mesh sizing is too fine. Please inspect your settings and try to reduce the fineness of your mesh or your refinement size.

*Please check the ‘Event Log’ and ‘Meshing log’ for more details.*In case of questions, please reach out to support or ask in the forum.

However, my fineness is set to 3.5 with select volumes being 4.5 - so I doubt, that it really is too fine?