What are Sheet bodies and how do I change them

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Hi Arta!
Thank you for posting on the forum!
There are two main rules which are crucial for any flow simulation:

  1. Your CAD needs to be watertight: There must not be any holes except inlets and outlets.
  2. Your CAD must only contain solid parts. Shells or Sheets must not appear.

Seems like you have some sheet bodies left.
You can read this article How to Find Faults in the CAD Model? | SimScale Knowledge Base to know more about how to convert them into solids!

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