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Sanity check in thermal stress simulation gone wrong

Question asked by Julius De Hond on Mar 5, 2019
Latest reply on Mar 8, 2019 by Julius De Hond

I'm trying to familiarize myself with simulating thermal stresses using static studies in Solidworks Simulation. I've set up a window (fused silica) in a stainless flange that are connected rigidly:




As a sanity check I tried to simulate the stress for zero temperature difference (using soft spring stabilization). Of course I'd expect no stress whatsoever, but I get quite a sizable von Mises stress:



Oddly enough, if I isolate the flange the same thing happens. I'm guessing I must have forgotten some constraint or setting somewhere, but I haven't been able to figure it out. If anyone has any ideas that would be fantastic (I've attached my assembly file).