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LS Dyna

LS Dyna

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  3. Slow runtime when using dynain files

Slow runtime when using dynain files

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    • May 20, 2025 at 3:59 pm
      ah3616
      Subscriber

      I have a question in regards to utilizing dynain files for my simulations in LSDYNA. We are running a quasi static expansion model which causes stress/strain in the material. I then want to use the quasi static model results as my input for an FSI model. I tried to utilize the dynain file to consider the stressed state of the solid material in my FSI model. However, when I used the dynain file as my solid mesh input file it caused major slowing in runtime. Upwards of 20x slower and I do not have the computing time for that.

      Is there anything that can be done to help fix this increase in runtime? As soon as I used the generic keyword file for the element/node locations without the stress/strain information - my simulation ran quickly (aside from some free node issues).

    • May 23, 2025 at 5:45 am
      igandiko
      Ansys Employee

      Hello, which version are you running? Have you tried a newer or dev version of the solver? Have you tried to reduce the contents of dynain file, just as a test, to narrow down the issue? Comparing the mes00* files, is there a drop in timestep between the two runs (with dynain vs without dynain)? 

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