Elmer Discussion Forum

Hi everyone! As you recommended, I added Air to the problem, but new questions arose. Now I have a box of air surrounding a copper sheet, I'll attach the .SIF file for you to check and this is the mesh: https://drive.google.com/file/d/1jRlJMuSOUay7eIWbWYRt2DPyOrni6y4R/view?usp=sharing I added two eq...

Hello, There is an ElmerGUI tutorial that may be helpful for you, if you want to simulate the air and heat convection due to bouyancy surrounding your model. Search for 'Rayleigh-Benard' in ElmerTutorials.pdf located here: https://www.nic.funet.fi/pub/sci/physics/elmer/doc/ Rich. Thank you very muc...

Oh! I know what you mean. No, you are right, It doesn't make sense to add viscosity to a solid and that's why I could not understand your proposal. What I want to know is if I set the boundary condition (BC) with the same Heat Transf. Coeff. (HTC) and Ext. Temp. in every face (but not the ones with ...

There is no difference because there are no buoyancy forces defined in the solution. To get buoyancy forces you have to add the stokes equation and turn on the buoyancy forces and compute the convection. Could you explain it in more detail? Because I try to do it with no success. If I add the N-S e...

Thank you both! Therefore, changing the unit vector for the gravitational force changes the direction of gravity and the direction of the buoyant force that always acts in the opposite direction of gravity. Yes, I assumed the same as you @kevinarden, but the results for two similar problems (I will ...

Hi everyone! I've been using Elmer with the Heat and StatCurrent Solvers, the second one to calculate Joule Heating and the first for heat distribution and transfer from a solid to ambient by convection. As far as I understood, to tell Elmer to do the convection part I have to add the Heat Transfer ...

Thank you!

Now the Joule Heating is 500000 which I assume is in W/m^3 because if a multiply it by the volume it gives me 50 W, close to what I was expecting. Also, 370 K at the hottest part so I'll be careful with that bar when I'll test this at the lab

That's weird. As you mention, the two boundaries are on the bores of two holes you mention, but in my GUI the #3 is a bore of a hole, and the flat faces are #5 and #6.

Hole bores: #2 #3 #8 #9
Big flat faces: #5 #6

Hi everyone! I'm new to Elmer and I'm trying to simulate a copper bar of 0.77x0.04x0.005 m^3 heated by the Joule Effect with a DC of 1kA between two terminals (0.0509 V if we use the resistivity of copper) and BC on all faces over the heat flux with the Heat Transf. Coef. of air 2.5 and a room tempe...