Learning Forum

[feng.jiang]

I am working on a simulation where I need to compute the response of an object under two different loadings. The first loading is always the same, but it takes a long time to compute, while the second loading is different.

If I have to compute both loadings every time (first and second), the total computation time will be very long. My question is whether there is a way to use the solution from the previous K-file as initial conditions for subsequent runs? This would allow me to only compute the first loading once and then just focus on the second loading in future simulations, saving a lot of time.

Is there a method to save the results from the first loading and use them as the starting point for future calculations? If anyone has a solution or any suggestions, I would appreciate it!

Thank you in advance!

[Raman Babu]

You can perform the first analysis and write out a dynain file which you can import in the second load case for further analysis. Dynain file contains initial stress & strain with deformed mesh from the first load case.

You can also use LS-DYNA restart approach.

Regards,

Raman Babu

 

[feng.jiang]

Thank you very much for your response! I'm still not quite clear on how to use dynain file. Would it be possible for you to provide some learning examples or video to help me better understand how to work with it?

Thank you!

[Dennis Chen]

Hi Feng Jiang, please take a look at below video that I made about the 3 different types of restarts in LS Dyna.   You can also look at the interface_springback keycard in the documentation for some additional detail.   Hope this helps. 

https://www.youtube.com/watch?v=8lFGT2q-dGw&t=0s