Hi, thanks for the tutorial I have learnt alot from you! When trying to replicate your steps to create this object I obtained a similar graph to yours, however my maximum temperature starts at around 203 degC and follows the same profile as your graph, ending at around 119degC. What do you think I might have done wrongly to have this consistent 50 degC difference in results?
Ok nevermind, i did not change the thickness of the thermal contact to 0.1mm, all good now! I'm going to leave this comment here in case anyone else runs into this same issue
I added a fourth heat flux where it was the bottom boundary of the chip and it reduced the temperature by a noticeable 2 degC. Am I allowed to do this or is it already factored in when we made it a heat source?
In the video it was assumed that there is no air convection beneath the chip so no heat flux was added there. You may assume there is some heat transfer to other components through conduction. But using the same convective heat flux would not be realistic.
Always use mapped mesh when you can (for rectangular geometries). Otherwise use tetrahedral mesh. Refine your mesh in the areas of interest where you want to study your component. The key thing to remember is that you need more elements in a region where a variable (like heat or displacement) has a high gradient, i.e. the variable is changing rapidly.
You need to look for symmetry in the physics. In this example, there is no heat transfer across the centre of the heat source due to symmetry. So you can cut the geometry in half. Comsol will automatically impose the thermal insulation boundary condition on the plane of symmetry. Then you have to reduce the heat source by half.
@@JafScience Thanks for your reply, I ended up getting almost the same results, just a bit more heat flowing from Si substrate to Al (which makes sense considering I could not add thermal contact) Thanks again
I don't know what you want to model. If you want to solve an equation which is not defined by default in any physics interface then you'll have to define it in variables and call it in the physics.
I appreciate your efforts to teach; I learned a lot from you...Thanks a zillion
You're welcome!
Very helpful video for learning. Thank you so much.
Thank you very much for the tutorial, pretty clear. Best.
Very useful video... Thanks for this valuable info
Thank you very much...
Thanks for your tutorial. Do we need to consider the surface-surface radiation between the fins?
If the difference in temperature of the fin surfaces is low then it's not needed.
nice video
Hi, thanks for the tutorial I have learnt alot from you!
When trying to replicate your steps to create this object I obtained a similar graph to yours, however my maximum temperature starts at around 203 degC and follows the same profile as your graph, ending at around 119degC. What do you think I might have done wrongly to have this consistent 50 degC difference in results?
Ok nevermind, i did not change the thickness of the thermal contact to 0.1mm, all good now! I'm going to leave this comment here in case anyone else runs into this same issue
I added a fourth heat flux where it was the bottom boundary of the chip and it reduced the temperature by a noticeable 2 degC. Am I allowed to do this or is it already factored in when we made it a heat source?
In the video it was assumed that there is no air convection beneath the chip so no heat flux was added there. You may assume there is some heat transfer to other components through conduction. But using the same convective heat flux would not be realistic.
@@JafScience Yes that makes sense, thank you for replying!
Thank you for your very nice video. Could you please share some experience of choosing type of mesh?
Always use mapped mesh when you can (for rectangular geometries). Otherwise use tetrahedral mesh. Refine your mesh in the areas of interest where you want to study your component. The key thing to remember is that you need more elements in a region where a variable (like heat or displacement) has a high gradient, i.e. the variable is changing rapidly.
How can we do a symmetric model analysis in comsol for heat transfer look like this example?
You need to look for symmetry in the physics. In this example, there is no heat transfer across the centre of the heat source due to symmetry. So you can cut the geometry in half. Comsol will automatically impose the thermal insulation boundary condition on the plane of symmetry. Then you have to reduce the heat source by half.
Hi, Why am I not able to find thermal contact option under boundaries? I use COMSOL 5.5
It's likely that your licence does not include features for thin structures (under which thermal contact can be found).
@@JafScience Thanks for your reply, I ended up getting almost the same results, just a bit more heat flowing from Si substrate to Al (which makes sense considering I could not add thermal contact)
Thanks again
@@tamemsalah7332 Glad it worked, you're welcome!
hello, how to simulate nonlinear heat transfer eq in comsol?
I don't know what you want to model. If you want to solve an equation which is not defined by default in any physics interface then you'll have to define it in variables and call it in the physics.
hello i want to ask you something. You can give email or something for me?
what is your question?