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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Point heat source in axial symmetry at origin

Posted 11.09.2018, 17:41 GMT-4 Heat Transfer & Phase Change Version 4.3b 1 Reply

Erik Horak
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Hi all,

I want to model a simple point heat source at the interface of 2 materials. I can make finite cylindrical slabs of material in 3D with the point source in the middle but it would be much more efficient to move to an axial symmetric model with a point heat source at the origin. Unfortunately, whenever I try to place a point heat source at the origin of the axial symmetry but no heat is dissipated in the model and the entire model stays at room temperature. Is there an easy way around this? Or is this fixed in a newer version of COMSOL (I have version 4b)?

Thanks,

Erik

1 Reply Last Post 12.09.2018, 06:53 GMT-4
Henrik Sönnerlind COMSOL Employee

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Posted: 6 years ago 12.09.2018, 06:53 GMT-4

Hi Erik,

In newer versions, the is a feature called Point Heat Source on Axis.

The problem lies in that a 'point source' in axial symmetry actually is a line source, unless placed on the axis of rotation.

You can solve your problem by manually adding a Weak Contribution to the point (with an expression like my_Q*test(T)).

Regards,
Henrik

-------------------
Henrik Sönnerlind
COMSOL
Hi Erik, In newer versions, the is a feature called **Point Heat Source on Axis**. The problem lies in that a 'point source' in axial symmetry actually is a line source, unless placed on the axis of rotation. You can solve your problem by manually adding a **Weak Contribution** to the point (with an expression like my\_Q\*test(T)). Regards, Henrik

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