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Moving a large laser beam across a surface
Posted Jul 9, 2012, 3:33 p.m. EDT Wave Optics, Heat Transfer & Phase Change, Heat Transfer 3 Replies
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Hi,
I am a new COMSOL user and would like to simulate the heating of a plate with a slow moving laser beam (v=1mm/s). The beam spot size is very large, approximatley 15mm diameter, and thus can not be modeled as a point source.
I am thinking of modeling it as a boundary heat source. I have a function, f(x,y), that defines the local intensity (W/m^2) of the laser beam. The function resembles a gaussian beam. I was thinking that I would simply substitute (x-v*t) for x in my function, in order to get the function to move in the x direction (v is the velocity of the beam, t is time). My boundary heat source is then f(x-v*t, y).
I have been searching to see if there are other posts that discuss this method for moving a boundary heat source across a part, but I have been unsuccessful.
I have tried it out it everything appears to be OK - the heat source appears to move across the part at the appropriate speed. Is there any reason why this method should not be used?
Thanks,
Blake
I am a new COMSOL user and would like to simulate the heating of a plate with a slow moving laser beam (v=1mm/s). The beam spot size is very large, approximatley 15mm diameter, and thus can not be modeled as a point source.
I am thinking of modeling it as a boundary heat source. I have a function, f(x,y), that defines the local intensity (W/m^2) of the laser beam. The function resembles a gaussian beam. I was thinking that I would simply substitute (x-v*t) for x in my function, in order to get the function to move in the x direction (v is the velocity of the beam, t is time). My boundary heat source is then f(x-v*t, y).
I have been searching to see if there are other posts that discuss this method for moving a boundary heat source across a part, but I have been unsuccessful.
I have tried it out it everything appears to be OK - the heat source appears to move across the part at the appropriate speed. Is there any reason why this method should not be used?
Thanks,
Blake
3 Replies Last Post Sep 16, 2012, 10:31 p.m. EDT
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Posted:
1 decade ago
You can also try to hold the laser beam fixed and the work piece moving in the opposite direction. This is called the eulerian approach. You can solve the problem in steady state and do not have deal with time variable.
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Posted:
1 decade ago
hi.i have the same problem(i' am simulating a 5mm diameter laser beam) .if you find a solution let me know
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Posted:
1 decade ago
sir,
i'm doing a project related to surface alloying using TIG heat source. How can model a moving work piece by fixing the heat source. Is there any help available for this type of problems.
with thanks ,
Robin scariah
i'm doing a project related to surface alloying using TIG heat source. How can model a moving work piece by fixing the heat source. Is there any help available for this type of problems.
with thanks ,
Robin scariah