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[lsuser888]

Hi there, 

I need to stop an explicit simulation and restart it with a modified termination time. After reviewing the LS-DYNA documentation, I understand that a simple restart should be used. I would like to ask how the restart keyword file should be prepared. Should I copy the current input file, rename it, and modify the termination time, and then use it as the restart input file (i = restartinput, R = D3DUMPnn)?

[Nanda]

To perform a restart analysis for a run that got terminated abruptly before the end time, or to increase the termination time, as in your case, a simple restart is the recommended one. 

 

For an MPP run, the LS-DYNA solver will create dump files such as d3dump01.0001, d3dump01.0002, d3dump01.0003, etc. in the directory where your input deck is located. The number of dump files will be equal to the number of cores used for the solve. For example, if 4 cores are used, 4 d3dump files are created as below:

 

In order to use simple restart, you will need to create a new input deck with a modified end time (*CONTROL_TERMINATION). Please note that this new input deck should only have modified keywords. In the input field, you should point to this new input deck with modified keywords (in your case only *CONTROL_TERMINATION), and in the expression field, replace i=$INPUT with r=d3dump01 in the command line of LS-RUN, such as below:

 

Always make sure to use the same solver settings (Version, cores, precision, MPI).

 

Regards,

Nanda.

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[lsuser888]

Thank you for your explanations. I am still not completely clear about creating the new deck. I have prepared one as you described and included a screenshot below that contains only the modified keyword. Is this correct?

[Nanda]

This looks correct. Please proceed and let us know if you run into any issues.

Best