Boolean subtract- “operation would result in non-manifold bodies”

- April 24, 2023 at 9:23 am
  
  Vasco Godinho
  Subscriber
  
  Hello everyone,
  I am studying the flow around a helmet and I am trying to perform a boolean subtract operation in ANSYS. However, I am encountering the error message "". I have seen in other posts that the helmet cannot be hollow, which is the case for my geometry obtained from GrabCAD. I have tried filling the inside of the helmet using CAD software, but due to the complexity of the geometry, I was not successful.
  Does anyone have any suggestions on how to proceed with this?
- April 24, 2023 at 10:53 am
  
  Rob
  Ansys Employee
  
  What do you want to do with the helmet geometry?
- April 24, 2023 at 11:06 am
  
  Vasco Godinho
  Subscriber
  
  I created an enclosure and now I want to define the fluid zone.
- April 24, 2023 at 11:13 am
  
  Rob
  Ansys Employee
  
  OK. You can either clean up the outer casing of the helmet & then mesh. The non-manifold issue is down to surfaces not quite touching, or rather touching with a zero area contact.
  Or, have a look at the Fault Tolerant Meshing option in Fluent Meshing.

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