Wondering if anyone has tips or comments to use of that option.
I have an axisymmetric model where L-beam cross-sections (which are "fill surfaces") are changed during optimizations. It seems like it would be necessary to check that option so that the elements stay shaped properly when dimensions change dramatically. I'd think this would be very stable... but my optimizations routinely get through 4-12 iterations... and then fail with a "your model is unconstrained" error.
I can change all dimensions to the last set and run a normal static analysis and nothing becomes unconstrained. If I re-mesh and re-start, the optimization typically chugs along find for a while again... and then comes unhinged.
If I do NOT use that feature, the optimization chugs along fine for a while... and then simply provides an unuseful "fatal engine error" message. I presume the elements get stretched or compressed to unacceptable shapes.
Anyone with experience out there that could help?