Error #1861 Internal Programming Error duzring Opti Check

Turbokraken

Hi Everyone,

I am just in the process of Setting up a regular topology optimization with a simple PSOLID and 10 constraints for 5 load cases and this Comes up all the time:

 

*** ERROR # 1861 ***
 Equality constraints can only be defined when the SQP or BIGOPT
 optimization method is selected on the DOPTPRM OPTMETH card.

 *** INTERNAL PROGRAMMING ERROR ***
   in file 'fiospa_new.F', at location # 1459.

 ****  ABORTING RUN DUE TO AN INTERNAL ERROR  ****

 ==== End of solver screen output ====

 ==== Job completed ====

 

I have been trying to incorporate a draw direction, but the Problem persists even when I remove the draw constraint from the model. What is the meaning of this and how can I find a Workaround?

I tried Setting the opimization method to SQP, as suggested, but it didnt do anything.

Unfortunately I cannot share the FEM data as the data is confidential.

 

I would greatly appreciate if you could help me with this.

 

Best Regards,

Lennart

Turbokraken

Whoops, solved it.

 

Appearently that's what you get when a constraint has a boundary of -0.5 to 0.5, but you Forget the first '-', causing it to be 0.5 to 0.5.

It now magically works, but this was not at all what the error message said and it caused an actual internal programming error?
Perhaps this is something for the developers.

 

BR,

Lennart