Base de connaissances du support

What to do when a linear stationary model is not solving

Solution numéro: 1260 Versions: Toutes les versions

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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How can I see the equations COMSOL is defining? How do I implement a user-defined Multiphysics coupling?

Solution numéro: 1259 Versions: Toutes les versions

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? How can I see the names of all ...

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Understanding the Fully Coupled vs. Segregated approach and Direct vs. Iterative Linear Solvers

Solution numéro: 1258 Versions: Toutes les versions

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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Solving electromagnetic heating models with high-frequency loads

Solution numéro: 1257 Versions: Toutes les versions

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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I get an error message when trying to open my glTF-file in an external viewer

Solution numéro: 1256 Versions: 5.4

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 ...

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Reducing the amount of solution data stored in a model

Solution numéro: 1255 Versions: Toutes les versions

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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Controlling the Time Dependent Solver Timesteps

Solution numéro: 1254 Versions: Toutes les versions

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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Solving Wave-Type Problems with Step Changes in the Loads

Solution numéro: 1244 Se réfère à: COMSOL Multiphysics Versions: Toutes les versions

I 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 ...

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License Error -5,414 in COMSOL Multiphysics

Solution numéro: 1252 Versions: Toutes les versions

I 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 ...

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Running parametric sweeps, batch sweeps, and cluster sweeps from the command line

Solution numéro: 1250 Versions: Toutes les versions

This 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 ...

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