FEM heat trasfer analysis

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sevgi 2024-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/2091186-fem-heat-trasfer-analysis

编辑： Torsten 2024-3-7

I have a problem with matlab code. I am doing heat transfer analysis in Matlab. One surface is exposed to heat flux, another surface is exposed to convection. Other surfaces are also insulated. I compare this code with 3D Cad simulation. But the results are different. While geometry max temperatures are around 100C in Matlab, they are around 200C in 3D CAD. What is the reason of this?

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John D'Errico 2024-3-6

@Torsten has no need for the crystal ball I have always depended upon. But just suppose he is right in this random guess? Yes, the odds are well under 1% that he guessed the correct line. We would all immediately be forced to acknowledge his supremacy, the god of MATLAB. In turn, this suggests all he needs to do is make similar wild guesses on hundreds of other questions where there is no possible way to know the answer. One of them will inevitably turn out correct, and Voila! I love it.

So yes, probable user error here. There is possibly/probably a mistake in your code. Possibly you used an incorrect boundary condition, or a wrong constant, or some other simple error of infinitely many kinds. Or possibly you made some mistake using the other tool.

If you want actual valid help on something like this, you need to show code, else nobody can ever do more than make wild, random guesses. A problem of course is your code is probably lengthy and maybe messy (one of those reasons is probably why you have not shown it) and that will make it less likely someone is going to offer timely help. That in turn suggests you want to spend some serious time debugging your code. How? Given that we see no code at all, how might you do that?

I might simplify the code. Change some of the boundary conditions. Verify that when you make the problem simpler, you get something that makes sense. If it does, then I'd spend a great deal of time to clean up the code. Simpler code will be easier for you to verify and debug. Yes, I know, this means almost rewriting your code from scratch. But if your code is incorrect and you won't show it, then you have no choice.

sevgi 2024-3-7

https://www.youtube.com/watch?v=ehh7pnbTnYo

The first application in the video in the link is similar to my study in terms of analysis conditions. In the first application of the video, the analysis is run by creating the geometry in the matlab window. I did the same analysis in matlab and Star CCM without importing the geometry. I got similar results. For this reason, I think the cause of the problem is the import of the geometry. Can I create my geometry in the matlab window as in this application.

Torsten 2024-3-7

编辑：Torsten 2024-3-7

I have no experience with the preprocessor of the PDE Toolbox - sorry.

But from other posts I got the impression that it's not easy to handle and not well-suited for complex geometries. So the import of geometries from CAD tools for the PDE Toolbox should be normal and error-resistant.

Why don't you contact Technical Support ?

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