Error# 2148: Invalid design problem.

User: "Sam George"
Altair Community Member
Updated by Sam George

Hello,

I am doing a topology optimization with objective to minimize the thermal compliance.

I get the following error.

 A fatal error has occurred during computations:

  *** ERROR # 2148 ***
  Invalid design problem.
  All the sensitivities of response 2 (objective) are zero.

I have attached the .out file, I would like to know what the possible reasons for this error could be. 

image

Would there be any example files to share if there is a topology optimization involving CFD and thermal inputs with Optistruct. 

Regards,

Find more posts tagged with

Sort by:
1 - 1 of 11
    User: "RobHoglund"
    Altair Employee
    Accepted Answer
    Updated by RobHoglund

    Hello Sam,

    The Thermal Compliance is extremely high for the heat transfer subcase.

     Subcase  Thermal Compliance 
           1  3.494810E+20

    Can you check and review your model unit system for the heat transfer analysis and the fixed temperatures and thermal loads?

    You can run a baseline analysis without the optimization on the model to check and see if the temperature results make sense first (use run option -optskip).

    OptiStruct also has Darcy Flow topology optimization capability for flow channel optimization considering heat transfer.  See here:

    https://help.altair.com/hwsolvers/os/topics/solvers/os/darcy_flow_analysis_intro_r.htm?zoom_highlight=darcy+flow

    Thanks,

    Rob H.