Support Knowledge Base

All Solutions

1120: Problems on Mac OS X 10.10 Yosemite

I just updated my operating system to Mac OS X 10.10 Yosemite. Now COMSOL 4.4 fails to start or install. Apply the COMSOL 4.4 compatibility update for Mac OS X 10.10 Yosemite. Go to...
Version: 4.4 - Platform: Macintosh

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

1116: Selecting hardware for clusters

This knowledge base outlines some hardware recommendations if you plan to set up your own compute cluster for running distributed COMSOL jobs. Depending upon the type of problems that you want to solve you will want to...
Version: All versions - Platform: Windows,Linux

1113: COMSOL does not start with the latest MATLAB version

I have installed a new MATLAB version, but running COMSOL with MATLAB keeps opening the older version of MATLAB. You need to manually update the MATLAB root directory path. ## Version 4.3 and later In the COMSOL...
Version: All versions - Platform:

1112: How to recover your work from an interrupted simulation

This knowledgebase describes how to benefit from the recovery feature in COMSOL 4.1 and later. This is particularly useful if you have a long computation that for some reason was interrupted at some point, maybe due...
Version: All versions,4.1 - Platform: All Platforms

1111: Updating the COMSOL Model Library

COMSOL Multiphysics contains an update service that enables you to download new models, full models, as well as updated/corrected models to your existing Model Library. This solution explains how it works and provides...
Version: All versions - Platform: All Platforms

1104: Stabilization schemes in COMSOL

How can I see which stabilization schemes are used by COMSOL Multphysics in transport physics interfaces such as Single-Phase Flow and Transport of Diluted species? Numerical solutions of transport equations can...
Version: All versions - Platform:

1102: Improve the stability of your contact model

In this article, you can find both general tips of how to improve convergence in your contact model and how to change solver settings of older models. ## Some General Contact Tips * The choice of source and...
Version: All versions - Platform: All Platforms

1101: Error: Pointwise constraints for time derivatives are not supported

How do I set up a boundary constraint condition involving a time derivative of the solution variable? I tried, but I keep getting the following error message:   If you are using a PDE interface and solving for the...
Version: All versions - Platform: All Platforms

1098: Creating an FTP directory to upload large files

Email servers may reject larger file attachments. If you want to provide COMSOL staff with model files larger than 10 MB, you can create an FTP directory to upload them. * Make sure you allow pop-ups in your browser. *...
Version: All versions - Platform: All Platforms