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Gaussian heat flux

Posted Sep 28, 2012, 1:28 p.m. EDT Wave Optics, Heat Transfer & Phase Change 5 Replies

Kurian Antony
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Hi
I need to model a moving laser Gaussian heat flux over a surface and i want to know the temperature and time.



kurian
5 Replies Last Post Jan 5, 2016, 8:37 a.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Sep 28, 2012, 2:58 p.m. EDT
Hi

there are already a few examples either in the model library, or in the model exchange, and / or Forum, try some searches. Also several articles from the confs

--
Good luck
Ivar
Hi there are already a few examples either in the model library, or in the model exchange, and / or Forum, try some searches. Also several articles from the confs -- Good luck Ivar
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Sep 28, 2012, 2:59 p.m. EDT
You can define a Gaussian pulse as a COMSOL function, then apply a boundary heat source over the whole surface that the pulse moves over. For the magnitude of the heat source put an analytical expression to define the moving pulse. For example if the pulse is moving in the X-direction, your expression can be something like gp1(x-k*t) where gp1 is the name of the Gaussian pulse and k is the speed of the pulse.

Nagi Elabbasi
Veryst Engineering
You can define a Gaussian pulse as a COMSOL function, then apply a boundary heat source over the whole surface that the pulse moves over. For the magnitude of the heat source put an analytical expression to define the moving pulse. For example if the pulse is moving in the X-direction, your expression can be something like gp1(x-k*t) where gp1 is the name of the Gaussian pulse and k is the speed of the pulse. Nagi Elabbasi Veryst Engineering
María Martín
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Posted: 1 decade ago Feb 19, 2014, 2:45 a.m. EST
Hi all, I have a problem in relation with this.
I am doing what you say an the behaviour is correct but the heating is not enought. I mean, when I introduce the gp1(x-v*t)*400[W] in the power option, the material does not reach the expected temperature; and I think that it is related with the definition, my model is a 2D model and the power is divided by an area and I dont know what's the meaning of this area "A". If I suppose that this area is the selected boundary(0.3m) multiplied by 1m, the value I should multiply by the power makes it smaller and thisproduces a small temperature value.
what's happening!?!?!
thanks a lot.
Hi all, I have a problem in relation with this. I am doing what you say an the behaviour is correct but the heating is not enought. I mean, when I introduce the gp1(x-v*t)*400[W] in the power option, the material does not reach the expected temperature; and I think that it is related with the definition, my model is a 2D model and the power is divided by an area and I dont know what's the meaning of this area "A". If I suppose that this area is the selected boundary(0.3m) multiplied by 1m, the value I should multiply by the power makes it smaller and thisproduces a small temperature value. what's happening!?!?! thanks a lot.
Letian Wang
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Posted: 1 decade ago Oct 30, 2014, 2:06 a.m. EDT
Hi Kurian

As Ivar said, I think you can check out the gallery: www.comsol.com/model/laser-heating-a-self-guided-tutorial-12317
also there is a paper: www.comsol.com/paper/download/63243/poulain_paper.pdf

I am also working on laser processing. Nice meeting you!

Letian


Hi
I need to model a moving laser Gaussian heat flux over a surface and i want to know the temperature and time.



kurian

Hi Kurian As Ivar said, I think you can check out the gallery: http://www.comsol.com/model/laser-heating-a-self-guided-tutorial-12317 also there is a paper: http://www.comsol.com/paper/download/63243/poulain_paper.pdf I am also working on laser processing. Nice meeting you! Letian [QUOTE] Hi I need to model a moving laser Gaussian heat flux over a surface and i want to know the temperature and time. kurian [/QUOTE]
Walter Frei COMSOL Employee

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Posted: 9 years ago Jan 5, 2016, 8:37 a.m. EST
For the general topic of laser heating as you're describing here, please also see:

www.comsol.com/model/13835

www.comsol.com/blogs/modeling-laser-material-interactions-in-comsol-multiphysics

www.comsol.com/blogs/modeling-laser-material-interactions-with-the-beer-lambert-law

www.comsol.com/blogs/tracking-material-damage-with-the-previous-solution-operator

www.comsol.com/blogs/modeling-a-periodic-heat-load

www.comsol.com/blogs/implementing-simple-temperature-controller-component-coupling
For the general topic of laser heating as you're describing here, please also see: http://www.comsol.com/model/13835 http://www.comsol.com/blogs/modeling-laser-material-interactions-in-comsol-multiphysics http://www.comsol.com/blogs/modeling-laser-material-interactions-with-the-beer-lambert-law http://www.comsol.com/blogs/tracking-material-damage-with-the-previous-solution-operator http://www.comsol.com/blogs/modeling-a-periodic-heat-load http://www.comsol.com/blogs/implementing-simple-temperature-controller-component-coupling

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