why do i always get error messages when i edit like no solid body or the facets error i have tried importing in many formats.
like these
like these
Perhaps the following will be useful:
There are two main rules which are crucial for any flow simulation:
- Your CAD needs to be watertight: There must not be any holes except inlets and outlets.
- Your CAD must only contain solid parts. Shells or Sheets must not appear.
Note: A sheet is a CAD geometry that is missing one or more faces.
In other words,
A few ways to do the CAD cleanup:
Also, try to import your model in a different file format. STL files are not recommended (unless for LBM or PWC simulations).
These documentation pages are useful for learning how to properly set up a CAD model :
and perhaps,
although it may be better to fix the issue using the same CAD tool used to generate the geometry.
Hi @Leen_Mohamed, thanks for posting on the Forum and welcome to the SimScale Community 
In addition to @nelta’s comments, there is an import option for STL files called ‘Optimize for LBM / PWC.’ When selected, the CAD model is imported as a faceted geometry, which is specifically tailored for use in PWC/LBM simulations - make sure it’s toggled off.
If you’d like us to take a closer look at your project, please post a project link (here’s a guide explaining how).
Cheers
Igor