OptiStruct Lattice Optimisation

Altair Forum User

Hi,

 

I was using the lattice optimisation tutorial in order to complete a lattice optimisation on my own component and it completed the first step no problem, producing the '_lattice.fem' file. 

 

However, when I then ran that through OptiStruct, I got the following error:

 

*** ERROR # 1814 *** MASSFRAC response on DRESP1 card 2 is not applied to a topology or free-size domain.

 

Please could you advise on what I should do?

 

Kind Regards, 

Iain

Altair Forum User

Hi Lain,

 

Can you please check if there are any design variables in the _lattice.fem file?

 

If not, please create the design variable(s).