i create an stl of a body made of polyeurathene but i cant make an enclosure because it is not a solid so i use STEP file or IGES but it creates sheets which the simulation doesn’t run by. How to fix this problem?
Just make sure that you your geometry contains solids in order to run the simulation. CFD Squad, can you give our user a helping hand please? 
Best,
Jousef
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It does contain solids i just cant make an exclosure
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I cant share but what can i do in this type of sistuation