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General Solutions

1232: Selecting entities by index number

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...
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1223: How to reference COMSOL Multiphysics® software in papers and...

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...
Version: All versions - Platform: All Platforms

1222: Persistent Unexpected Errors when Running COMSOL on OSX 10.11 El...

When I run COMSOL on OSX 10.11, El Capitan, I get repeated Unexpected Errors. Add the line -XX:-OmitStackTraceInFastThrow to the file /Applications/COMSOL52/Multiphysics/bin/maci64/com​sol.ini If this does not...
Version: 5.1,5.2 - Platform: Macintosh

1216: The usage of Form Union and Form Assembly

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...
Version: All versions - Platform: All Platforms

1213: Manually setup the geometric multigrid solver

The geometric multigrid solver accelerates the convergence of the iterative solver by solving the finite element problem on a series of meshes rather than a single one. The multigrid algorithm starts with the initial...
Version: All versions - Platform: All Platforms

1168: The New Hover-and-Click Selection Method in COMSOL 4.4 and COMSOL 5.0

How can I select interior surfaces in my geometry in COMSOL 4.4 and above? The new way of selecting geometry objects or geometric entities in COMSOL 4.4 (and later versions) is a one-click selection. To select...
Version: 4.4,5.0,5.1 - Platform: All Platforms

1118: Resolving time-dependent waves

I am solving a time-dependent wave problem, but the solution does not look quite right. I was expecting a smooth propagating waveform but see mostly noise. The accuracy in a model solving an equation for...
Version: All versions - Platform: All Platforms

1030: Error: "Out of memory"

I get an error message, that contains the words Out of memory, for example: Out of memory during LU factorization. or Out of memory during assembly Background Before resolving this issue, you should go through...
Version: All versions - Platform: All Platforms