Thermal Stress Analysis

Shubham_20947
Shubham_20947 Altair Community Member
edited December 2021 in Community Q&A
Hello sir,
I am getting error like this.
 
((((*** ERROR # 4800 ***
Grid 1 connected to element 1 has no temperature
specified in load set 2. To apply zero temperature on this grid,
SYSSETTING,undeftemp,zero needs to be added to the deck.

****************
Too many error messages. Aborting run.
Current limit is 10000. Use "MSGLMT" control card to change this value.))))


I was analysing a heatsink 3D component for a practice purpose, and as per the problem statement I created the spc constraints and temperature on their respctive faces, but once clicking on Optistruct to obtain the result, I found this error appearing in the message log.
Can you please help me out here to resolve this issue?
 
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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited December 2021

    for thermal stress analysis, all grids need to have temperatures assigned, so that OS can calculate thermal expansion and so on.

    Usually we run a thermal analysis first, and then use the temperatures as boundary conditions for all nodes, not only the face nodes.

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