@Emperor
What do you mean by “speed dynamics”? Do you mean Explicit Dynamics? I understand that requires linear elements, but the implicit solver used for dynamics problems can work with quadratic tetrahedral elements. The benefit of tet elements is you can get a result quickly with a coarse mesh and very easily refine the mesh where needed. Contrast that with the time you will spend simplifying the geometry and slicing it up to get a hexa mesh, and how difficult it is to refine the mesh later. This is why I recommend a quadratic tet mesh.
https://www.youtube.com/watch?v=lVBUohWJct4&ab_channel=AnsysLearning
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