r/COMSOL

Hello, I would like some information. I am just starting with COMSOL and I am encountering several issues with my simulations.

First, I will explain my setup:

I am currently working with an industrial furnace made of tantalum and niobium for its heat reflectors, with a graphite crucible in the center. This furnace is heated by Joule effect with a current of 346 A flowing through the entire structure.

I am using the following physics: Electric Currents and Heat Transfer in Solids. In addition, I include heat dissipation using Surface-to-Surface Radiation for all the relevant parts of my furnace (the furnace body, reflectors, crucible, as well as the surfaces exchanging heat with the external environment).

The materials used are custom-defined materials that allow me to vary their thermal and electrical conductivity as a function of temperature in my model.

My problem arises when I try to go beyond 500 A: the model then encounters convergence issues and sometimes even crashes after only a few iterations.

Have you experienced similar problems, or do you have any suggestions for resolving this issue?

https://preview.redd.it/paf0wivpvn0h1.png?width=683&format=png&auto=webp&s=afdb2e3ebaf5b59097bb05c0bf347496efcb97df

Hello, i am having a bit of trouble on how to launch a CFD simulation in COMSOL Multiphysics 6.4 .

I made this geometry using MATLAB and exported it as an STL file. Passing it through MeshLab to clean it up and used quadratic edge collapse to reduce the number of faces.

I am a complete newbie to COMSOL. I tried following a youtube tutorial about particle tracing in simulating a laminar static particle mixer (Here's the link for those interested : https://www.youtube.com/watch?v=UmxOT16Ch1A).

I tried recreating the steps using my geometry, but everytime I try meshing I get the following error.

COMSOL Multiphysics 6.4 Mesh building error

I tried to make a cylinder that wraps around the geometry directly in the STL file and importing it at once, but i cannot select them separately (In order to set the cylinder as the walls where the fluid domain should be).

I would be very appreciative of any guidance or suggestions as to how I should approach such problem.

Hi, all,

I was able to set up comsol to use its gui but use the university cluster to do mesh building and computation. Upon trying to compute I get the following error " Out of memory during assembly". Since I am using a cluster node with 192 GB RAM I am confused as to why is this happening. Please help! thanks!

https://preview.redd.it/05m7n8ul080h1.png?width=516&format=png&auto=webp&s=eccf771ce20c6b7e58fa9b1bba95428a803e7f29

https://preview.redd.it/fc7ctj26a40h1.png?width=1918&format=png&auto=webp&s=c52c3aba9d0612538d3bf7d4761a546efad68873

As you can see, I chose an example from the COMSOL model library. However, when I go to the Results section to view the graph plots, they are all blank. I do not know why this is happening or how to fix it.

This is the PDF from COMSOL for this example. You will see the graphs I am referring to inside it: https://www.comsol.com/model/localized-corrosion-14591

can someone please send a ssb comsol model which is validated through a research paper or any article

I'm using COMSOL with a 2 week trial key I got by emailing customer support but I was wondering if anyone has done this multiple times.