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  1. xuxxx679

    Abaqus CFD Issue

    Hi, Has anyone here used Abaqus CFD to run steady state before? I found that the results will vary with the iteration number you gave. Did anyone run into the same problem before? Thanks, Danny
  2. xuxxx679

    Abaqus CFD problem

    Hi. I have a question about the Abaqus CFD. I want to simulate a period of 6000s but the time increment is too small, it eventually went below machine precision and gave me an error. When i tried to use fixed time increment, it gave me an error saying that the accumulated error is too large and...
  3. xuxxx679

    FEA software selections

    Hi there, I'm wondering what is the FEA software you guys think are the best for heat transfer analysis? I'm currently using Abaqus now but I found it is difficult to use compared with COMSOL which I used for one and a half years. Among three major FEA packages, Abaqus, COMSOL, Ansys, which one...
  4. xuxxx679

    Heat sink temperature

    Thanks everyone for your response, the accuracy of the thermocouples should be fine. @itsmoked, I put a small amount of insulation over it and the temperature did go up but it is still lower than TC1. Is there a way to attach the TC so I can make sure the TC is measuring the surface...
  5. xuxxx679

    Surface temperature issue

    Hi, I'm doing a model about heat transfer in Abaqus. I found that for the component I had, the internal temperature simulation match well with the actual experiment results. but when I try to match the surface temperature, the error becomes large, Abaqus seems to overestimate the surface...
  6. xuxxx679

    Surface temperature issue with Abaqus

    Hi, I'm doing a model about heat transfer in Abaqus. I found that for the component I had, the internal temperature simulation match well with the actual experiment results. but when I try to match the surface temperature, the error becomes large, Abaqus seems to overestimate the surface...
  7. xuxxx679

    Heat sink temperature

    Hi, Here is a brief graph of a test that I've been doing. The material is copper and system is under natural convection. At first, I thought the temperature measured at thermocouple 2 will be higher since the thermal resistance from the bottom of the base to tc2 should be much smaller than to...
  8. xuxxx679

    About Abaqus GUI

    Hello, I've seen the built-in customized GUI that Abaqus allows us to create and use. But they are for people who already knows how to use Abaqus or at least have Abaqys installed in their laptop. I'm wondering if anyone has tried to create a python GUI to run Abaqus so that even someone...
  9. xuxxx679

    Hex and Tet meshing in thermal anlaysis

    Hi, I've been told that hex meshing is always better than tet in mechanical simulations (stress, contact, etc). I'm wondering if the same thing is true in thermal analysis? Also, is it required to use hex20 instead of hex8 for transient thermal analysis since for transient the heat equation is...
  10. xuxxx679

    About mesh used in thermal analysis

    Hi, I've been told that hex meshing is always better than tet in mechanical simulations (stress, contact, etc). I'm wondering if the same thing is true in thermal analysis? Also, is it required to use hex20 instead of hex8 for transient thermal analysis since for transient the heat equation is...
  11. xuxxx679

    General Question: Error of simulation

    thank you guys very much. The purpose of this simulation is to match the experimental results. The setup is very simple, it's mainly just heating up a metal bar. The issue i'm facing that the error i got for a transient analysis is between 0.5 to 2 degrees(temperature increase is 30 to 80)...
  12. xuxxx679

    General Question: Error of simulation

    Hi, I was asked a general question: how much error between simulation results and experimental data can be considered as accurate? I'm really not sure how to answer this question. My area is thermal analysis. Does anyone working on thermal have some thoughts on that? Thanks, Danny
  13. xuxxx679

    About the heat transfer coefficient used in Abaqus

    Hello, I'm doing a thermal analysis in Abaqus and I have a question about how the heat transfer coefficient is defined in Abaqus. When I select a surface, if I define the heat transfer coefficient as temperature-dependent, will Abaqus calculate the average temperature of that surface and then...

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