I am performing a joule heating with time dependent heat transfer. I have selected the "Heat Source" and "Temperature" boundary conditions and performing a time dependent study. However I am getting a temperature which remains constant for all the time steps. This remains the case no matter how small I give my time step.
Hello Harshad,
Can you send me your .mph file so that I can check on.
-Kishore
Dear Harshad,
According to Andreas Hantsch it is quite difficult to give an answer without details about the model and geometry.
However, along with the space boundary conditions, I assume you have correctly set the initial condition, i.e. the temperature in the whole geometry at t=0 s.
If everything is correctly set, I think the problem may be in the wrong definition of the heat source, not high enough to cause changes respect to the initial conditions. Try to consider different values for heat source paired with different simulation times.
Actually, if you think to strongly increase the value of the heat source, you could have numerical instability if an abrupt change occur in a (very) short time. Accordingly, you could prevent such a situation by defining a gradual increase of the heat source up to the desired value.
Good luck!
Hi,
Thank you for your answers. The present problems I am facing is that [1] The temperatures are going bizzare high like 16000K and the other problem I am facing is [2] the heat transfer is instant throughout the metallic parts i.e. there is no "heat conduction or diffusion" time required for the temperature of the whole system to rise with time. I am attaching my comsol file, please look into it.
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