I am getting an error in Simulation about low order pyramid element shapes that are not valid in the current analysis. Can I force a solution with low order pyramids?

For the issue that you are having with the meshing in Simulation, you have probably asked the mesher explicitly to drop the midside nodes, and some hex-to-tet-transition pyramids were created in the process. Simulation currently uses the SOLID185 low-order element for structural analysis, which does not support the pyramid shape, so no, it is not possible to force a run with these elements.

The suggested workaround is to mesh with higher-order SOLID186 elements (do not drop midside nodes), which do support the pyramid degenerate shape.

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