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Ansys / LS-DYNA Help Forum
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February 3, 2023 8:54 am
Hello, im new to Ls-dyna. I have made a structure to be tested against a blast load but when i run the simulation the model just flies into the air, what is the reason for this ? I have attached the file
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February 3, 2023 10:48 pm
Hi @george-m,
It looks like you have your gravity load curve flipped. It needs to be positive not negative, which I know seems backwards but it's just the way LS-Dyna handles global load direction. Below is a thread and I've also linked the dyna examples page.
https://feassistant.com/forums/ls-dyna/gravity-acting-opposite-for-some-parts-and-not-others/
https://www.dynaexamples.com/introduction/examples-manual/load/gravity