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heatSource errors respect to physical experiments

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Old   December 17, 2024, 03:29
Default heatSource errors respect to physical experiments
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Suhan Umur Okuducu
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In OpenFOAM 2406, for a solid cellZone region within the flow domain, I modeled a scalarSemiImplicitSource with h=10W. However, even in a steady-state solution, this source continuously increases the temperature of the solid region. In physical experiments, the temperature of a heat source stabilizes after some time. I do not think there is an error in my reasoning, but I would like to ask whether it is possible to model such a heat source behavior in OpenFOAM.
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Old   December 17, 2024, 05:58
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So, let's think about the physics for a moment. You are pumping in 10W of heat into the solid with a source term - fine so far. This is a suitable and effective approach.

Now - where does the heat go? You say in the experiments that the solid temperature asymptotes after a while, so you must be allowing heat to conduct/convect away from the source and out of the domain. The temperature will stabilise when the heat exiting the domain equals the heat you are pumping in through the source. So my advice is that you check you boundary conditions. Check the fluxes on the boundaries. Are they behaving as you expect?

Good luck.
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Old   December 17, 2024, 06:19
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Quote:
Originally Posted by Tobermory View Post
The temperature will stabilise when the heat exiting the domain equals the heat you are pumping in through the source. So my advice is that you check you boundary conditions. Check the fluxes on the boundaries. Are they behaving as you expect?

Good luck.
Thank you for your response. I understand you very well. What you said makes a lot of sense. I'm not a CFD expert, of course, but I don't think there's a problem with the boundary conditions since I applied the same things from the relevant tutorial. However, there are still some things I need to check again.

Could my problem be that I didn't run the analysis long enough for the endTime?

Best Regards
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Old   December 17, 2024, 06:46
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Could my problem be that I didn't run the analysis long enough for the endTime?
Yes - that's quite possible, and a good place to start. You can plot the variation in T with time, and you should see the increase tailing off with time.
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