Moving Laser Beam

fshak92 · June 19, 2012, 08:48

I want to simulate the thermal effect of a laser beam(which is moving) on a multiphase surface.
I would appreciate if anyone has ideas about the way(s) i can simulate the moving laser beam.(In Ansys and/or Star-CCM+and/or OpenFOAM)

Thank you in advance.

ghorrocks · June 19, 2012, 20:04

So is it simply a moving heat source? This is easy to implement in just about any CFD code.

fshak92 · June 20, 2012, 06:04

Thank you for you reply.

Before going to the multiphase case,I tried to do a sample Solid case,by defining a table with the moving heat flux according to time.

a) Im not sure it will be the correct way to set a defined heat flux to the fixed coordinates in multiphase case.

b) Making a table to simulate the moving heat flux, somehow is time consuming.Because i should change the heat flux in each coordinates and each time step.(Below is a sample version of table i've used)

x y z t(1s) t(2s) t(3s) ...
1 0 0 500 0 0
2 0 0 0 500 0
3 0 0 0 0 500
.
.
.

Do you have any idea or suggestion about 'a' and 'b' ?
Thank you in advance.

lffabiani · June 20, 2012, 13:16

CEL expressions can do a lot!

I used the following expression on a heat source:

(max(z-Z1,0[m])/abs(z-Z1))*-35000 [W m^-3]

Where Z1 = 5 [m]

So while z < Z1, the heat source = 0.
If z > Z1 then heat source = -35000 [W m^-3]

Maybe you can do the same with coordinates and time.

June 19, 2012, 08:48	Moving Laser Beam	#1
fshak92 Senior Member Join Date: Dec 2011 Posts: 121 Rep Power: 14	I want to simulate the thermal effect of a laser beam(which is moving) on a multiphase surface. I would appreciate if anyone has ideas about the way(s) i can simulate the moving laser beam.(In Ansys and/or Star-CCM+and/or OpenFOAM) Thank you in advance.

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June 19, 2012, 20:04		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,711 Rep Power: 143	So is it simply a moving heat source? This is easy to implement in just about any CFD code.

June 20, 2012, 06:04		#3
fshak92 Senior Member Join Date: Dec 2011 Posts: 121 Rep Power: 14	Thank you for you reply. Before going to the multiphase case,I tried to do a sample Solid case,by defining a table with the moving heat flux according to time. a) Im not sure it will be the correct way to set a defined heat flux to the fixed coordinates in multiphase case. b) Making a table to simulate the moving heat flux, somehow is time consuming.Because i should change the heat flux in each coordinates and each time step.(Below is a sample version of table i've used) x y z t(1s) t(2s) t(3s) ... 1 0 0 500 0 0 2 0 0 0 500 0 3 0 0 0 0 500 . . . Do you have any idea or suggestion about 'a' and 'b' ? Thank you in advance.

June 20, 2012, 13:16		#4
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	CEL expressions can do a lot! I used the following expression on a heat source: (max(z-Z1,0[m])/abs(z-Z1))*-35000 [W m^-3] Where Z1 = 5 [m] So while z < Z1, the heat source = 0. If z > Z1 then heat source = -35000 [W m^-3] Maybe you can do the same with coordinates and time.