All Solutions
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 ...
"Data access entity removed" occurs in my application
Solution Number: 1247 Versions: All versionsWhen running my application, I get the error "Data access entity removed". If a node is removed, Data Access to the node becomes invalidated. In general this error occurs if nodes used in Data Access are explicitly ...
Solving Models with Step Changes to Loads in Time
Solution Number: 1245 Versions: All versionsHow should I model loads that change magnitude at a particular time? I am solving a transient model which has loads that change instantaneously in time, but the solver appears to be missing some of these changes in ...