I am trying to do a simple linear buckling analysis, where one end is fixed and the opposing end has a prescribed displacement of -0.1m in the x-direction that compresses the structure. Solver cant find any eigenvalues it seems. Any ideas what I could try to fix this and get those precious buckling modes?

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  • $\begingroup$ I don't know anything about COMSOL, but if there are no loads that can change in the model, I'm not surprised it can't figure out what you want to do. If you just want to calculate the pre-stressed vibration modes of the structure, that should be possible as a nonlinear stress analysis + normal modes analysis. If you really want to find the buckling load, try creating a constraint to make the "prescribed displacement" surface planar (so the structure can't deform in ways you don't want) and then apply a load to it. You can then convert the buckling load back to a displacement if you want. $\endgroup$
    – alephzero
    Commented Jun 23, 2021 at 18:01
  • $\begingroup$ Thank you @alephzero. By making the prescribed displacement surface planar, do you mean apply it to not just the blue highlighted area as I did, but entire red face? As seen in this picture: imgur.com/a/R0reGfM $\endgroup$ Commented Jun 23, 2021 at 19:38


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