Common error messages and options how to address them
"Optimization Utility seems slow/does not use all available cores""Logfile says:"
NUMBER OF PROCESSOR THREADS REQUESTED = 2 NUMBER OF PROCESSOR THREADS AVAILABLE = 8 NUMBER OF PROCESSOR THREADS USED = 2 |
By default, the installation is configured to use two threads only. To change this, edit <Netfabb installation folder>\Nastran 2018\nastran.ini and set NPROCESSORS to a higher figure. Note: Though it says "threads", we recommend you test for your system whether using the number of physical cores, rather than virtual cores, isn't the better option.
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| "FEA driver error. Error solving Nastran model" |
Check the logfiles created in the project folder for further clues pertaining to the problem. |
| "T2214: MATERIAL PROPERTY ID 1 IS NOT UNIQUE" |
If you have multiple parts in the project, on the Simulation tab, make sure they all have the same workspace selected. 
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| "FATAL ERROR E5001: NON-POSITIVE DEFINITE DETECTED AT GRID […]" |
If you have forces acting into a lattice, on the Parts tab, make sure that the interfacing surface is set to Skin, not Solid. Select Solid only for parts that are actually fully solid. 
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| Generic "Mesh is not suitable for FEA" or similar |
Check the model manually for self-intersections using Netfabb. Some mesh faults can be tricky to detect and/or are not automatically checked for, and can trip up FEA retriangulation. |