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General Mechanical

General Mechanical

Topics related to Mechanical Enterprise, Motion, Additive Print and more.

transient thermal’s solution problem

    • n2390n
      Subscriber

      Hello, I'm facing a problem that other users have encountered.

      Based on previous posts, I've noticed that other users have encountered similar issues. I've read through their posts, but I still can't seem to resolve the problem myself.

      I checked the guidelines in Workbench. The handbook provides a formula that suggests users should use appropriate timestep sizes. However, I'm not sure about this cuz my results seem incorrect.(negative TEMP)

       

      timestep :20

       

       

      A five-layer rectangular prism model (8000*1600*1 um) with a mesh size of 0.4 um, where the top layer provides heat flux.

       

      and the initial temperature of the model is 22

      .

       

      And after confirming the material properties, there are no errors in the settings. Could anyone tell me where I may have missed something in the settings that led to results contradicting physical phenomena?

    • Erik Kostson
      Ansys Employee

       

       

      Hi

      Except of using smaller time step (try that , so calculate dt time step as shown here : https://www.linkedin.com/pulse/calculating-solution-settings-transient-thermal-analysis-eric-stamper)

      also the mesh and it size can influence.

      See here for more info:

      https://simutechgroup.com/transient-thermal-analysis-with-non-physical-temperature-results/

      All the best

      Erik

       

       

    • n2390n
      Subscriber

      hi, Erik:

      are u suggest using different mesg sizing setting? 

      this pic shows my setting for this case

    • Erik Kostson
      Ansys Employee

      Hi

      I would suggest to really look through the posts in detail:

      Mesh related: https://simutechgroup.com/transient-thermal-analysis-with-non-physical-temperature-results/

      Time step related: https://www.linkedin.com/pulse/calculating-solution-settings-transient-thermal-analysis-eric-stamper

      All the best and hope this info helps

      Erik

    • n2390n
      Subscriber

      got it, thx alot

      Will try it through

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