FEA Re-analysis of topology optimisation

Altair Forum User
Altair Forum User
Altair Employee
edited November 2020 in Community Q&A

Good Evening,

 

I have completed a topology optimisation and I am happy with results but now I want to to re-run the analysis.

 

I open ossmooth, load the model and results, use 'keep smooth layer around' and remesh using a 'mixed' mesh type.

 

I then go to run the analysis (-optskip) and I get an error message regarding compliance.

 

I don't understand what's causing this as the loads and constraints are all attached to the non design space. Is it a mesh issue?


 *** WARNING #  312
 In static load case            1
 the compliance is negative or large   3.974381E+11
 Optimization/buckling analysis cannot be performed
 due to possible rigid body mode

 *** WARNING #  312
 In static load case            2
 the compliance is negative or large   1.253294E+12
 Optimization/buckling analysis cannot be performed
 due to possible rigid body mode

 

Thanks in advance for any help, this forum is an excellent resource and has got me this far. I just need a little help with this last step.

 

Kind Regards,

 

Mike

 

 

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited April 2016

    Hi,

     

    This is usually because of incorrect or insufficient BC's, Model not being connected properly with other components, incorrect model units etc.. 

     

    Regards

    Rahul R

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2016

    Hi Rahul,

     

    Thanks for your response :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

     

    I believe it was caused by the connection between the design and non design space after optimisation, I'm not sure though!

     

    Thanks,

     

    Mike

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