USM3D is an all tetrahedral, cell-centered, finite-volume solver from NASA Langley Research Center. For more information, visit the official web site
Grids are exported in the USM3D format in Unformatted and in Double precision. An additional CAE attribute can be specified to
control maximum exported segment size and thus convert export automatically to multi-segment. See the USM3D page under
Set Solver Attributes for more details.