Different Results from PC and High Performance Computer

Question

I have made an Nastran input File and run this on Nastran on my PC and on an High Performace Computer. It was an modal analysis (SOL103). The first six Eigenvalues are different. What could be the reason for different Outputs while using the same Input?

Hrishikesh Phadke · Accepted Answer

Are the first six eigenvalues rigid body modes? If so the values can be different and are all still numerically zero.