when i generate my mesh the process goes well until at 70% it stop
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Hi @mmolinaro, thanks for posting on the forum and welcome to the SimScale Community 
This might be due to you having a very large mesh, which will make it so that it takes much longer to be generated. The mesher is divided in three steps (so the 70% mark does not mean the mesh is literally 70% completed, only that the first step is done).
Small faces and gaps might make your model especially susceptible to needing a large mesh - and giving the mesher a hard time as well! Preparing your CAD is a crucial step in this case.
If you want us to take a closer look, make sure to share your project’s URL.
Best,
Igor