General

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 ...


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 ...


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 ...


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 ...


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 ...


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 ...


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 ...


Selecting entities by index number

Solution Number: 1232 Applies to: COMSOL Multiphysics Versions: All versions

I am following the step-by-step instructions for building an example COMSOL Application and the directions specify a numeric list of entities ( such as boundaries or domains ) to select. How do I find out which ...


How to reference COMSOL Multiphysics® software in papers and publications

Solution Number: 1223 Versions: All versions

I am a licensed user of COMSOL Multiphysics® software and am publishing an article, paper, book, image, or conference proceeding based upon my own modeling work. How should this be referenced? As a licensed user who is ...


The usage of Form Union and Form Assembly

Solution Number: 1216 Versions: All versions

There is an option to Form Union or Form Assembly at the end of the Geometry sequence. What does this mean and when should I switch between them? The Geometry branch within the Model Builder consists of a sequence of ...