Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Transient heat transfer simulation boundary condition not working. Help!
Posted 4 déc. 2016, 22:09 UTC−5 2 Replies
Please login with a confirmed email address before reporting spam
Hello everyone,
I am trying to simulate the thermal effect of a laser welding process. I created a transient Simulation and defined functions to turn the laser on for 10ms and off for 10ms then on again and so forth. Then I created different spots where the heat source should be applyed to with an intensity: 148000000*rect1(t) [W/m^2], 148000000rect2(t),... etc.. When I run the simulation for some reason (which I cannot explain) the laser (heat BC) does not begin with the first spot, it then beginns with the 10th or so spot. As I need the maximum Temp in a specific area skipping welding spots falsifies my solution.
Anyone know why this could be happening?
FYI I used COMSOL with MATLAB to create the model (initial conditoins, boundary conditions and mesh). Then I saved it as a COMSOL file and ran the simulation in COMSOL
Cheers and thank you for your time,
Andreas
I am trying to simulate the thermal effect of a laser welding process. I created a transient Simulation and defined functions to turn the laser on for 10ms and off for 10ms then on again and so forth. Then I created different spots where the heat source should be applyed to with an intensity: 148000000*rect1(t) [W/m^2], 148000000rect2(t),... etc.. When I run the simulation for some reason (which I cannot explain) the laser (heat BC) does not begin with the first spot, it then beginns with the 10th or so spot. As I need the maximum Temp in a specific area skipping welding spots falsifies my solution.
Anyone know why this could be happening?
FYI I used COMSOL with MATLAB to create the model (initial conditoins, boundary conditions and mesh). Then I saved it as a COMSOL file and ran the simulation in COMSOL
Cheers and thank you for your time,
Andreas
2 Replies Last Post 5 déc. 2016, 01:19 UTC−5
Please login with a confirmed email address before reporting spam
Posted:
8 years ago
Here the MATLAB file to create the COMSOL files:
Attachments:
Please login with a confirmed email address before reporting spam
Posted:
8 years ago
Is it possible that you time-stepping in the solver does not match with the laser pulses? That happened to me when I applied a pulsed BC.
BR
Lasse
BR
Lasse