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I have a large, complicated, model that is not solving, or taking a long time to solve. What should I do? There are a number of reasons why a model may not be solving, or solving very slowly. This article describes...
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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...
Version: 5.4 - Platform:

When running COMSOL Multiphysics, COMSOL Server, or COMSOL Client in an Internet Protocol version 6 (IPv6) environment, some functionality may not work as expected unless you apply the software patches made available...
Version: 5.4 - Platform: All Platforms

When running running a model that uses the MUMPS solver repeatedly on my multicore processor, I notice a small gradual increase in Memory Consumption. Please make sure that your COMSOL Multiphysics 5.4 installation is...
Version: 5.4 - Platform: Windows, Linux

When running large models on a cluster with COMSOL Multiphysics 5.4, the MUMPS solver hangs or crashes. This issue has been fixed in Update 4 for COMSOL Multiphysics 5.4. Please update your COMSOL installation to...
Version: 5.4 - Platform: Windows, Linux

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

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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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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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 variables...
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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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