According to the statistics, there are 2700 nodes and 2860 elements.

Anyway, I ended up trying to remodel the whole thing in SpaceClaim (since I previously use sketchup format and import it as geometry).

I could not find any guide regarding which geometry is considered to be "ansys friendly" and which is not. Even though skp., dwg., and other formats could be imported, SpaceClaim (or Solidworks) seems to be the only one which is guaranteed working in ansys

Quite troublesome, but I think that is the only way..