Ребята, с кем можно созвониться на час-полтора бесплатно, чтобы вы показали, как работать с СOMSOL? Базу я плюс-минус знаю. Теперь интересует CFD-моделирование теплообменника.
Заранее благодарен!
Hi everyone, I’m trying to understand how long-term thermal behavior is usually handled in COMSOL for rotating machines. For example, PMSM simulations are often performed over only a fraction of a second or a few electrical cycles, but if I want to study the temperature evolution over 1–2 minutes, how is this normally done? In my case, I have a rotating conducting plate heated by permanent magnets, and a fully coupled electromagnetic + thermal simulation becomes extremely heavy because the electromagnetic field has to be solved continuously during the rotation. What is the recommended approach for predicting the temperature after 1–2 minutes without simulating every single rotation over the entire period?
I am simulating a structure in which there is a magnet on top, positioned 20 mm away from a PDMS film. Just above the film, there is a substrate separated by a spacer. I am using contact pair between film and substrate. When deformation occurs, the PDMS film tends to penetrate the substrate instead of causing it to deform. Can anyone help me understand how to resolve this issue?
I am importing 2D .dxf files from Autodesk Fusion to use as geometry in my simulations. In Fusion these circles are continuos but as they are imported they get these additional points every 90 degrees around all circles in the model.
This is quite tedious since many very small boundary/line segments are created which become messed up during meshing with features like "Distribution".
Why does every circle have to be segmented like that? Does anyone have any tips to work arounf this? I would rather avoid having to manually repair and modify each model everytime I import it into COMSOL, but if that is the only way I would love to know how!
Thanks!
I would like to ask if anybody simulated Microbial Fuel Cells (MFCs).
Also, what physical phenomena or governing equations are typically coupled in an MFC model to predict its performance metrics, such as voltage, current density, power density, and COD removal?
Any help would be great as I don't know how to start with COMSOL about this matter.
Hello,
I am using the "Magnetic Fields" and "Heat Transfer in Solids" interface coupled with "Electromagnetic Heating" multiphysics to simulate the heating of 10 kV cables.
Everything has been running well and I have been able to do some test simulations but out of the sudden, without changing much, I have started getting this error:
>Feature: Time-Dependent Solver 1 (sol1/t1)
Undefined material property 'mur' required by Ampère's Law in Solids 1.
I was very confused and went back to double check my material properties, that my domains were properly defined, the correct domains were assigned to the correct physics nodes etc. and everything looks like it did before (i.e. correct according to me) when I could run simulations. I have restarted the program and cleared meshes, rebuilt geometries etc.
After some messing around, without doing any real change to anything, the error changed into:
>Feature: Time-Dependent Solver 1 (sol1/t1)
Undefined material property 'epsilonr' required by Ampère's Law in Solids 1.
I have checked everything eight times now and even went for a walk before continuing troubleshooting but there is no apparent reason for my errors. Either I have missed something trivial or there is some bug I am not aware of. Does anyone recognise this issue? Any help is appreciated.
Thanks!
Edit: I missed to assign two domains back to their selection. Also, I learnt that looking at the "Material" node it is possible to see the domains/boundaries missing a material :)