time step calculation
Hello
I have two geometry rectangular and hexagonal. I used same material and same mesh size for both.
why their time step is different.
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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.
Thanks
Hi,
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.