I quite randomly came across this post. Depending on the objective in Ansys, it's not a clear-cut answer. At the moment exporting an INP with the boundary conditions predefined in nTop is generally the best approach. Depending on the scenario you can also choose to export a surface mesh and use Ansys's Layer Tetrahedron Meshing Method. For going to Fluent, I generally recommended exporting a Surface MSH file with the boundary condition faces predefined in nTop as well.
I realize this is a very late reply but I hope it is helpful.
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New Post - Reply To: any body know about nTopology software and how we can import geometry from nTop to ansys workbench?