All Solutions
What to do when a linear stationary model is not solving
Solution Number: 1260 Versions: All versionsI am solving a linear stationary finite element model but the software is not solving. Why? What can I do about this? A linear finite element model is one in which all of the material properties, loads, boundary ...
How can I see the equations COMSOL is defining? How do I implement a user-defined Multiphysics coupling?
Solution Number: 1259 Versions: All versionsI would like to define my own customized coupling between two existing physics interfaces. How can I do this? How can I find the names of the variables that I will need to use? How can I see the names of all ...
Understanding the Fully Coupled vs. Segregated approach and Direct vs. Iterative Linear Solvers
Solution Number: 1258 Versions: All versionsHow, and why, switch between a fully coupled and a segregated approach to solving a multiphysics model? How, and why, switch between the direct and iterative linear system solver? ## Fully Coupled versus Segregated ...
Solving electromagnetic heating models with high-frequency loads
Solution Number: 1257 Versions: All versionsI am solving a Multiphysics problem involving electromagnetics and heat transfer. The electromagnetic fields are varying at a constant frequency, and the period is very short compared to the timespan over which the ...
I get an error message when trying to open my glTF-file in an external viewer
Solution Number: 1256 Versions: 5.4After exporting a glTF-file from my COMSOL Multiphysics model, I get an error message when I try to open it in an external viewer. The most probable cause for this issue is that the external glTF-file you are using ...
Reducing the amount of solution data stored in a model
Solution Number: 1255 Versions: All versionsMy models contain a lot of solution data, and I do not want my file sizes to get too large, it takes a lot of disk space. What can I do to reduce file size? Will this reduce the time it takes to solve the model? File ...
Controlling the Time Dependent Solver Timesteps
Solution Number: 1254 Versions: All versionsI am solving a transient model and changed the stepsize in the Times: field in the Study Settings, but the solver is still taking exactly the same timesteps. It seems the timesteps that the solver is taking are not ...
Solving Wave-Type Problems with Step Changes in the Loads
Solution Number: 1244 Applies to: COMSOL Multiphysics Versions: All versionsI am solving a transient model and am expecting the solution to oscillate over time in response to step changes in the loads. How should I set up such a model? What solver changes should I make? Certain models will ...
License Error -5,414 in COMSOL Multiphysics
Solution Number: 1252 Versions: All versionsI receive the following or similar error message: License error: -5 No such feature exists Feature: SERIAL License Path: C:\...\license.dat FlexNet licensing error:-5,414 This error is either triggered from the ...
Running parametric sweeps, batch sweeps, and cluster sweeps from the command line
Solution Number: 1250 Versions: All versionsThis solution describes how to launch a parametric sweep, a batch sweep, or a cluster sweep simulation in COMSOL Multiphysics® from the command line. ## Short Summary Model methods are presented as a concept to ...