Govindan Nagappan
Ansys Employee

Are there any other messages in the message window?

Check the help link for supported features - NASTRAN Export Supported Features (ansys.com)

If you have features that are not supported, make sure you suppress that in the tree before exporting to Nastran format

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Can Simcenter read Ansys files? If it does, you can send an Ansys input file.