Ansys Polyflow requires all element Jacobians to have the same sign. If not, when converting the HYPERMESH mesh file, Ansys Polydata will try to reorient the incorrectly oriented elements:
Geometrically (that is, on the basis of the coordinates)
Topologically (that is, on the basis of the connectivity numbering).
If any improperly oriented elements cannot be corrected, Ansys Polydata will report that the mesh connectivity is incorrect, and you will have to return to HYPERMESH to reorient these elements.
Note: Ansys Polydata corrects the orientation for all imported meshes, not just for HYPERMESH.