Support Knowledge Base

Setup and Meshing of Infinite Elements, Perfectly Matched Layers, and Absorbing Layers

Solution Number: 1272 Versions: All versions

I am setting up a model where I want to include a region of infinite extent. How should such situations be modeled and meshed? #Overview There are three options for modeling a domain that is meant to represent a ...

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COMSOL crashes on startup after updating to Debian 10

Solution Number: 1266 Versions: 5.4

After updating my Debian installation from Debian 9 to Debian 10, COMSOL crashes on startup. This issue has been observed by some Debian users when updating from Debian 9 to Debian 10. There are two possible solutions ...

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

Solution Number: 1259 Versions: All 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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Solving electromagnetic heating models with high-frequency loads

Solution Number: 1257 Versions: All 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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Reducing the amount of solution data stored in a model

Solution Number: 1255 Versions: All 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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Running parametric sweeps, batch sweeps, and cluster sweeps from the command line

Solution Number: 1250 Versions: All 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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Solution number is out of range

Solution Number: 1249 Applies to: COMSOL Multiphysics Versions: 5.3a

You compute a distributed parametric sweep on a cluster. When processing the results some values are missing or you get errors such as "The solution number is invalid" or "Solution number is out of range". This issue ...

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When changing the value in the Expression cell in my table, the value is not updated.

Solution Number: 1248 Versions: 5.2a, 5.3, 5.3a

I am running COMSOL Multiphysics on Windows, and when trying to change the value in the Expression cell in one of my tables, the value is not updated.This issue in the Expression cells of all tables where there is auto ...

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Out of Memory

Solution Number: 1243 Versions: All versions

The error "Out of Memory" occurs. Of the available memory (RAM and virtual memory), one section, the Java heap, is reserved for Java. The rest of the memory will be available for meshing and solving. If you receive the ...

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Reducing the size of your COMSOL Multiphysics file

Solution Number: 1238 Versions: All versions

I would like to reduce the size of my COMSOL Multiphysics model file. There are several things that you can do to reduce the file size: First, COMSOL saves files in either a compressed or uncompressed state. You can ...

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