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Question about Adaptive Mesh Refinement - COMSOL

Posted 19 lug 2011, 05:43 GMT-4 Mesh Version 4.2 2 Replies

Itxaso
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Hi,

I am trying to simulate a point heat source that follows a spiral path in 2D. I want to have a fine mesh around the heat source (where thermal gradients are more marked), but coarser in the rest of the model.
If I define the Error Indicator as "sqrt(Tx^2+Ty^2)", the refinement works well, but then (when the source moves away and the thermal gradients are not so marked), the mesh doesn't recover its original element size. It remains being fine.

What can I do to return to a coarse mesh in areas distant to the source, once it has moved away? I attach the .mph model.

Thanks in advance,

Itxaso

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2 Replies Last Post 3 nov 2011, 21:58 GMT-4
COMSOL Moderator

Hello Itxaso

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Clinton Canaday
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Posted: 1 decade ago 3 nov 2011, 13:23 GMT-4
I would also like to know if it is possible to do this through the GUI. I don't see why it would be difficult to implement programmatically, either. Coarsen if error is below a certain threshold and refine if it is above...keeping error in a band of tolerance.
I would also like to know if it is possible to do this through the GUI. I don't see why it would be difficult to implement programmatically, either. Coarsen if error is below a certain threshold and refine if it is above...keeping error in a band of tolerance.
Vincent Zhang
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Posted: 1 decade ago 3 nov 2011, 21:58 GMT-4
Hi Itxaso:

I have computed your model. But the result is different from yours. Refinement works well. The mesh of heated area become coarse again.

NDF also fluctuated.

Number of degrees of freedom solved for: 4089.
Number of degrees of freedom solved for: 4072.
Number of degrees of freedom solved for: 3476.
Number of degrees of freedom solved for: 2822.
Number of degrees of freedom solved for: 3176.
Number of degrees of freedom solved for: 3344.
Number of degrees of freedom solved for: 3164.
Number of degrees of freedom solved for: 3358.
Number of degrees of freedom solved for: 3417.
Number of degrees of freedom solved for: 3188.


I work on 4.2.0.228
Hi Itxaso: I have computed your model. But the result is different from yours. Refinement works well. The mesh of heated area become coarse again. NDF also fluctuated. Number of degrees of freedom solved for: 4089. Number of degrees of freedom solved for: 4072. Number of degrees of freedom solved for: 3476. Number of degrees of freedom solved for: 2822. Number of degrees of freedom solved for: 3176. Number of degrees of freedom solved for: 3344. Number of degrees of freedom solved for: 3164. Number of degrees of freedom solved for: 3358. Number of degrees of freedom solved for: 3417. Number of degrees of freedom solved for: 3188. I work on 4.2.0.228

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