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Problem trying to move heat source.

Posted Feb 1, 2011, 10:18 a.m. EST Heat Transfer & Phase Change Version 3.5a 5 Replies

Adam Collins
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Hi all,

I wish to model a moving heat source very similar to the 'heating with a moving laser' model in the model library.
However my heat source is a 2D circle on the outside of a 3D block and I am defining a certain heat flux through the circular surface.

I tried to use same method as in the 'heating with a moving laser' example (extruding a mesh and then coupling the 3D temperature variable to the 2D boundary condition).

The program does not give any errors when run but the heat source does not move, it remains stationary heating the one spot.

I have most likely made a litany of errors in defining this model and I would be very grateful if someone could point some of them out to me.

Thank you in advance!
5 Replies Last Post Feb 2, 2011, 9:44 a.m. EST
Adam Collins
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Posted: 1 decade ago Feb 1, 2011, 10:48 a.m. EST
Probably should have specified I'm using a extrusion coupling variable to couple the variable T. I have it specified under subdomain variables, perhaps it should be specified under boundary variables as the heat flux is on one boundary only?
Probably should have specified I'm using a extrusion coupling variable to couple the variable T. I have it specified under subdomain variables, perhaps it should be specified under boundary variables as the heat flux is on one boundary only?
Adam Collins
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Posted: 1 decade ago Feb 2, 2011, 9:24 a.m. EST
Forgive my vague description I am new to COMSOL and am sturggling to get to grips with it.
If someone knows of a simpler way of getting a heatflux on a boundary to move across another boundary I would really appreciate the help.


Forgive my vague description I am new to COMSOL and am sturggling to get to grips with it. If someone knows of a simpler way of getting a heatflux on a boundary to move across another boundary I would really appreciate the help.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 2, 2011, 9:28 a.m. EST
Hi

there should be an example either in the model library or on the main web site, of a laser source heating (and cutting) a metal slab, try a search

--
Good luck
Ivar
Hi there should be an example either in the model library or on the main web site, of a laser source heating (and cutting) a metal slab, try a search -- Good luck Ivar
Adam Collins
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Posted: 1 decade ago Feb 2, 2011, 9:38 a.m. EST
Hi Ivar,

I have been trying to work from the inbuilt 'heating with a moving laser model', I presume this is the model you are refering to?

This model couples 1D temperature to 3D, whereas I wish to couple 2D to 3D.
If you know of any other models which might be of use to me I would be grateful if you could let me know.

Hi Ivar, I have been trying to work from the inbuilt 'heating with a moving laser model', I presume this is the model you are refering to? This model couples 1D temperature to 3D, whereas I wish to couple 2D to 3D. If you know of any other models which might be of use to me I would be grateful if you could let me know.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 2, 2011, 9:44 a.m. EST
Hi,

I believe we are talking about the same model then, it should be a good starting point.

Then its to get the 2D to 3D extrusion correct. Start perhaps with a simpler thermal profile until you get the grasp of the extrusion use, it has changed (in the way you define it, not really on the principle) enough to make me hesitate to give you any clues, would have to redo my homework myself first, an 3.5 is getting old for me too ;)

--
Good luck
Ivar
Hi, I believe we are talking about the same model then, it should be a good starting point. Then its to get the 2D to 3D extrusion correct. Start perhaps with a simpler thermal profile until you get the grasp of the extrusion use, it has changed (in the way you define it, not really on the principle) enough to make me hesitate to give you any clues, would have to redo my homework myself first, an 3.5 is getting old for me too ;) -- Good luck Ivar

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