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Coupled Field Transient – how to add Imported Heat Generation; ICTE question

    • Łukasz Ruba


      I've created Coupled Field Transient project and I want to import heat generation from a file. When I did it in Thermal Transient it looked like this:

      but now i don't see this option:

      The file which I use looks like this:

      Is it related to the physical area where I only have structural and thermal analyses? I was reading this website: and see that only Steady-State Thermal, Transient Thermal, Thermal-Electric can import heat generation. Is there any way around this?

      Also, I have a question about orthotropic ICTE. I'm not sure if I'm using it correctly. I want to define material conditions that cause the body to expand only when the body temperature is between 80 and 120 degrees Celsius, so I defined it like this:

      I was reading this presentation: and I don't understand why when I define a coefficient of 0 at some temperatures it is wrong. When I use this equation:

      it doesn't mean that when coefficient = 0 the strain is 0? I will be very grateful if someone explain it to me. Maybe is there a better way to define exansion only between some temperatures?


      Best regards,



    • Dave Looman
      Ansys Employee

      Yes, this is a documented limitation:

      Even with the instantaneous coefficient of thermal expansion, the thermal strain will not be zero at a temperature just because the ICTE is zero.  It’s the integral of ICTE from Tzero as you showed in your question.  Also, numerically it’s not ideal to make a large step change in the value.


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