Learning Forum

[Fady Elshazly]

Hello,

 

I am working on a model in LSDYNA that goes through dynamic relaxation followed by a transient analysis. How can I run the dynamic relaxation once and then used its results to be applied to the transient analysis directly without the need to run both again each time I solve the model. 

 

Thanks 

[Alex R.]

Hello, 

To restart a simulation after DR phase you can submit a small restart using the d3dump written at the conclusion of the DR phase. 

Please look at this tutorial about restart using LS-DYNA: https://ftp.lstc.com/anonymous/outgoing/jday/restart.pdf

Alex. 

[Fady Elshazly]

Thanks for providing that valuable source. When I try to restart after the dynamic relaxation, the final output does not have a d3plot file to be opened in lsprepost. Is there a way to generate that?

 

Thanks

[Ushnish Basu]

The restart uses the d3dump file. If you want to make changes to the model, e.g. add or remove parts for the transient analysis, you can use full-deck restart

 

[Fady Elshazly]

I am using small restart but the restart process does not generate a d3plot file. it provides d3plot01,d3plot02.... but not the d3plot file. 

 

Thanks 

[Ushnish Basu]

For small restart the d3plot is from the initial run

[Fady Elshazly]

Great, thanks for clarification. 

Rgards