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time step calculation

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I have two geometry rectangular and hexagonal.  I used same material and same mesh size for both.   

why  their time step is different.




Rectangular time step.JPG

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the difference is because the characteristic element length is computed differently for shell and hexahedral elements:

-Quad Shell: The square root of the shell area

The critical length can vary with: • Shell formulation • Hourglass control parameters • Numerical damping • Membrane damping

-8-node Hexahedral: Volume / largest face area


I think the characteristic element length should be the same if element shape is close to ideal (square and cube), but could be different for distorted shapes.


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Hi beytut


I recommend you to go through the RADIOSS ebook, Explicit analysis using Radioss  (https://altairuniversity.com/free-ebooks-2/free-ebook-crash-analysis-with-radioss-a-study-guide/) where all the basics for explicit analysis including time step calculations are covered.



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