OSSmooth of Iteration x

Altair Forum User

Hi all,

 

I just completed a huge optimization (>30h), where optistruct ran into the limit of iterations (80). Unfortunately the final iteration violates the constraints by 140% (not clear why...). however, iteration 64 showed exactly what i'm looking for and was OK (3% violation) with all constraints. 

 

Is there a way with OSSmooth to select a certain iteration to reanalyze?

 

if not, is there any other way how i can get to the results from that iteration (preferably) without running it again?

In case i set the number of iterations to 64, will i get exactly the same design?

 

 

 

thanks in advance,

regards

Michael

 

Altair Forum User

Hi Michael,

 

Please let us know what is the type of optimization you are running.

 

If it is topology, you need .sh file and the parent (original) solver deck for further evaluation.

 

In order to get .sh file for a particular iteration you can use the SHRES option in Control cards>> OUTPUT

 

Go to Analysis page>> Control cards>> OUTPUT>> SHRES>> (ALL for all iterations, N= 64 in your case for a particular iteration). This writes out a .sh file in the working directory with name.iterationnumber.sh notation.

Altair Forum User

hi,

 

It's a combined topology and shape optimization. 

 

so then I need to re-run the analysis when i changed the output options?

 

Thanks,

Michael

Altair Forum User

Hi Michael,

 

Yes, you have to run the analysis again.

 

Since you have shape optimization you may also want the grid file.

 

Include OUTPUT>>GRID>> ALL or N in the output to get the .grid file as well.

Altair Forum User

Altair Forum User said:

Hi Michael,

 

Yes, you have to run the analysis again.

 

Since you have shape optimization you may also want the grid file.

 

Include OUTPUT>>GRID>> ALL or N in the output to get the .grid file as well.

 

So without the GRID file it will use the topology results on the 'non-distorted' (non-shape changed) mesh?