What are batch licenses and how can I use them?

Solution Number: 1304 Versions: All versions

##What are Batch Licenses? The license file for COMSOL Multiphysics® contains a list of license features that correspond to the different COMSOL products and software components. With a single Floating Network ...

The Magnetic and Electric Fields Interface with Electrical Circuit Gives an Unexpected Error for Transient Studies

Solution Number: 1301 Versions: 6.1

After installing Update 1 for COMSOL Multiphysics 6.1, I receive an unexpected error when solving a transient study with the Magnetic and Electric Fields and Electrical Circuit interfaces. The log file that I access ...

The Log Window in COMSOL Multiphysics is Unreadable on my Linux computer

Solution Number: 1287 Versions: All versions

The Log window in my COMSOL Multiphysics sessions looks like this: This issue is most commonly observed on Ubuntu 20.04 LTS (Focal Fossa) when the package texlive-fonts-recommended is present. But it has been ...

Is COMSOL 5.5 Supported on Cray Clusters?

Solution Number: 1276 Versions: All versions

COMSOL Multiphysics version 5.5 supports distributed memory computing on Cray clusters. We have verified that COMSOL Multiphysics version 5.5 runs in distributed mode on the Cray XC40 under CLE 7.0. We have tested that ...

Thread placement on >64 logical cores on Windows

Solution Number: 1275 Versions: 5.5

On Windows computers with more than 64 logical cores (e.g. with more than 32 physical cores and Hyperthreading enabled as recommended) thread placement for COMSOL Multiphysics or COMSOL Server can be inefficient. You ...

Resolving Time-Dependent Waves

Solution Number: 1118 Applies to: Acoustics Module, COMSOL Multiphysics, MEMS Module, RF Module, Structural Mechanics Module, Wave Optics Module Versions: All versions

I am solving a time-dependent wave-type problem, what mesh and solver settings should I adjust for better accuracy and runtimes? The accuracy of a time-dependent model solving for electromagnetic, acoustic, ...

Solving Complicated Models

Solution Number: 1267 Versions: All versions

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 ...

Memory Leak in the Fortran Runtime Libraries

Solution Number: 1264 Versions: 5.4

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 ...

The MUMPS Solver Crashes or Hangs During Cluster Simulation

Solution Number: 1263 Versions: 5.4

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 ...

Improving Convergence of Transient Models

Solution Number: 1262 Versions: All versions

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 time ...

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