Are you doing some testing? For a rod analysis, you’ll want to export your model as a STEP file. Or if you are using Onshape, there is a direct import on SimScale - Using Onshape and SimScale for product design.
Then for the mesh type you’ll need a tet-mesh (Fully automatic tet) with a fineness of 2 or 3.
Let me know how it goes and if you have any more questions I’m happy to help.