Description:

 

OptiStruct currently supports restart functionality for Nonlinear Analysis and Optimization.

Typical use cases for restarting a nonlinear analysis are:

• Restart from the last point at which the initial run was interrupted (for example, due to a power outage).
• Restart from the end of a successful nonlinear analysis and append new nonlinear subcases in continuation.
• Restart from some point of a nonlinear analysis, truncate the nonlinear subcase at that point and append new nonlinear subcases in continuation. (This can be accomplished using the TERMI option on RESTARTR Bulk Data Entry).
• Restart from some point of a successful nonlinear analysis and append new linear STATSUB(BUCKLING/PRELOAD/BRAKE) subcases. The linear STATSUB(BUCKLING/PRELOAD/BRAKE) subcases should reference the ending nonlinear subcase.

Procedure:

1.In model browser Right click on Card>Create> RestartW.

2.Select required parameter for RestartW control.

Here,

• n: Identifies the frequency of writing nonlinear restart analysis information files
• Option: COVER

 Whenever a new restart analysis information file (*.rnl) is written, the previous restart analysis information file is removed, unless it was the last frame for a nonlinear subcase.

• Path: RMDX

Activates enhanced Restart functionality where, in addition to the traditional *.rnl file, a new <filename>.rmdx file is output. The new .rmdx file contains the full model information and you can define only additional data (new subcases and so on) in the RESTARTR run. In this case, the traditional. rmd restart model file is not output.

 

Figure 1. RESTARTW in I/O section of .fem file

This will create RESTARTW.

 

4. Now for second case we will read this result to use in second subcase. Right click on Cards>Create> RESTARTR

 

5.Select option to control RESTARTR.

 

For this run filename _sub1_inc0010 is used to continue second subcase from result of filename.fem.

 

Figure 2. RESTARTR in I/O section of .fem file

Example