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1262: Improving convergence of transient models

Transient models involve computing a solution that varies over time. To do so, the software begins with the given initial conditions and computes the evolution of the unknowns using one of several different...
Version: All versions - Platform: All Platforms

1261: Performing a Mesh Refinement Study

How do I gain confidence in the accuracy of the solution to my problem? How do I perform a mesh refinement study? All of the numerical methods used within COMSOL Multiphysics® discretize the modeling space via a Mesh...
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1260: What to do when a linear stationary model is not solving

I 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...
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1259: How can I implement a user-defined Multiphysics coupling?

I 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? The ability to define arbitrary, and...
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1258: Understanding the Fully Coupled vs. Segregated approach and Direct...

How, 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...
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1257: Solving electromagnetic heating models with high-frequency loads

I 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...
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1256: I get an error message when trying to open my glTF-file in an...

After 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...
Version: 5.4 - Platform: All Platforms

1255: Reducing the amount of solution data stored in a model

My 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...
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1254: Controlling the Time Dependent solver timesteps

I 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...
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1253: When the primary server for our license server triad crashes,...

When using a three-server redundancy setup for hosting the license manager, license handling does not work correctly if the designated Primary server goes down. To work around this, make sure that the license manager...
Version: 5.3,5.3a,5.4 - Platform: All Platforms