Why InternalHeatSource function doesn't accept variable internal heat expressions in terms of state.u?

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Diego 2020-5-1

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评论： Diego 2020-5-6

Greetings

I am trying to create a internal heat source that is a function of Temperature for a steady state simulation. However it seems that InternalHeatSource function doesn't accept functions that declares the internal heat source value that are function of state.u, but when I write, in the same expression, location.x in place of state.u, the code does works. Does anyone know the reason why?

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Ravi Kumar 2020-5-5

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Hi Diego,

If you insert a breakpoint in the q function and set a condition (numel(state.u)>1), then you will observe that solver does call the q function with various values of solution. So it does see new values of q at different solution values. I think it might be just plotting issue. You are plotting the initial step if you don't specify right column ID in the T matrix (note T is a matrix now). If I change the plot command to:

pdeplot(model,'XYData',T(:,end),'Contour','on','ColorMap','hot');

then I get the following plot:

Hope this helps resolve your issue.

Regards,

Ravi

Diego 2020-5-6

Thank you so much Ravi,for spending your time to help me! It completly solves the issue!

The routine gives a maching but whith a better resolution than the finite difference version that I made previously. I'm realy happy with the results since this code will allow me to analize the problem in a 3D version.

Again, thanks for helpping me solving this problem!

Best Regards

Diego

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