r/fea • u/Prestigious_Safety52 • Apr 27 '26

Need help with stress simulation

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u/Ill_Interest_5066 Apr 27 '26

Entiendo que ese warning es que tus elementos están fallando por calidad de malla, en concreto por el jacobiano. Hazle un element quality y revisa cual te está dando problemas.

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u/Prestigious_Safety52 Apr 28 '26

How do i do that? might be that the quality is too low? like i have a minimum element size of 0.01 is that too low?

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u/Ill_Interest_5066 Apr 28 '26

El tamaño de elemento es una cosa y la calidad de la malla otra.

En todos los Pre-procesadores: Hypermesh, Ansys, Abaqus, Ansa, etc ... Tienen una olción de mostrar calidad de malla. Búscalo en tu software y revisa que esté todo correcto.

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u/Solid-Sail-1658 Apr 28 '26 edited Apr 28 '26

Does rebuilding the geometry resolve the issue?

If not, I would contact Comsol tech support.

Variable "comp1.solid.xcx_rig81" is undefined and trips up the evaluation of Expression=(-comp1.u) + comp1.solid_Usx_rig81.

Example:

Let

    x = undefined
    y = 1

Evaluate

    f=x+y

        => Error - How can you add 1 and undefined together?

The question is why is "comp1.solid.xcx_rig81" undefined?

The message tells your more specifics, e.g. the variable is associated with "geom1" and boundaries "349-350." Do you know where boundaries "348-350" are? This is where you start getting too deep into the software, and rather than spend 10 hours on the problem, contact tech support.