As mentioned in Exporting a Geometry, the oSP3D Nastran export interface cannot write a ready-to-use Nastran input file from start to finish because the oSP3D kernel does not provide the information needed to do so. The interface exports the mesh definition in the long format type as bulk data file only, meeting the requirements given in Importing Nastran Mesh Input Files.
On output, the mesh definition can be represented using these bulk data entries:
| Entry | Description |
|---|---|
CEND | — |
BEGIN BULK | — |
CTRIA3 | Used for oSP3D shell element definition of 3n triangles |
CTRIA6 | Used for oSP3D shell element definition of 6n triangles |
CQUAD | Used for oSP3D shell element definitions of 4n, 8n, and 9n quadrangles |
CTETRA | Used for oSP3D continuum element definitions of 4n and 10n tetrahedra |
CHEXA | Used for oSP3D continuum element definitions of 8n, 20n, and 27n hexahedra |
GRID | The x, y, and z coordinate in the global coordinate system |
The export interface tries to keep oSP3D indices as long as possible, intervening in the following cases only:
Index spaces starting in oSP3D at
0are shifted by one to meet Nastran requirements.If oSP3D contains several parts, the exporter interface translates the index space automatically into a continuous one.