Ensure NASTRAN structural and model are open & running
Make sure .out (nodal Temperature) file from thermal analysis is in the working directory
File/ Import/ neutral file: select the *.out file
(This reads it into your *.db file, it creates a field TEMPN.1.1)
Input reference temperature: this is done for each of the materials in the model:
Materials/ Modify-input correct ref. Temp/ ok / apply
Loads/BCs Button
Create / Temperature / Nodal
New Set Name – Label the boundary condition
Input Data – Select existing Spatial field that is shown (because of the .out file)
OK
Select application region – FEM / Select all nodes – Add
OK
Apply