It didn't help, but I simulated the model again as I was running out of time and had to share the results with someone. Thank you anyway for your advice.
I have another QFN package model similar to this one. However, in the new model, I have a quarter model of the package on both sides of the PCB solid body as I'm trying to simulate dual PCB packaging stress. Can you suggest where to apply the Fixed Support boundary condition? I feel like if I apply it to either one of the bottom vertices, it will be closer to one package compared to the other. I don't have any vertices in the middle of the PCB as it's one single square-thick solid body. Any suggestions for this? Should I slice the PCB body into two parts from the middle and then apply a fixed support at one of the vertices from that mid-plane?
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