INTERNAL ERROR in ESLM when buckling (LAMA) constraint included


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Many thanks Prakash!
In case an older version works well with this type of application, please recommend it (plus a way to download it) to me.
Regards,
Tanut


P.S. Optistruct 13.0.210 complains an internal error when running ESLM optimizaiton with several loadcases. I have to get back to 13.0.0.98 to avoid this.


Dear Prakash,
May I ask if there is any update on this matter?
Regards,
Tanut


Thanks Prakash, please let us know whenever this problem is fixed.
Tanut


Hi,
For now there is a workaround to get rid of the error.
Include PARAM,ALTBUCK,0 in the deck. Edit the solver deck with notepad and supply the PARAM,ALTBUCK,0 as shown in the attached image.
Note: The ALTBUCK card cannot be accessed through GUI. It should be manually supplied in the deck.


Thank you Prakash!
It works but not completely.
When I have other constraint e.g. displacement limit for nonlinear loadcase in addition to buckling constraint (LAMA), I get this programming error:


Hi,
I shared a file with you. Please use that and check if you still get the same error.


I still get the same error, so I should check your Optistruct verison.
Mine is


Hi,
I have the same version




Many thanks Prakash for your great support but I think we are mixing up TWO models here...
The test.txt file you just sent above does not reflect my problematic model. So, I attach the file I am struggling with here again:
https://www.dropbox.com/sh/0nqezeb8q95cbf1/AACjXJYzpkCudD8KOG0Sz2Gva?dl=0
If you can run the attached file, please let me know.
Many thanks,
Tanut


Hi Tanut,
I think yes, sorry about that.
I checked with experts and suggested to remove the CSTRESS= ALL output from implicit dynamic subcase (make sure PARAM, ALTBUCK, 0 is still available).
I ran withtout CSTESS and the analysis is through the error.
Hi,
I am checking with the developers on this. I will get back to you ASAP!