Base de connaissances du support

Setup and Meshing of Infinite Elements, Perfectly Matched Layers, and Absorbing Layers

Solution numéro: 1272 Versions: Toutes les versions

I am setting up a model where I want to include a region of infinite extent. How should such situations be modeled and meshed? #Overview There are three options for modeling a domain that is meant to represent a ...

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Understanding, and changing, the element order

Solution numéro: 1270 Versions: Toutes les versions

What is the meaning of element order, or discretization, and how do I change it? What affect does it have on the mesh and the solution? Why does the mesh look like it has straight sides even with higher-order ...

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When changing the license file on the license server, COMSOL Multiphysics loses contact to the license server

Solution numéro: 1271 Se réfère à: COMSOL Multiphysics Versions: 5.5, 5.4

When the license file hosted by the license manager is changed, my running COMSOL Multiphysics session loses the connection to the license manager and does not reconnect again. This issue will be fixed in COMSOL ...

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Error when trying to start the license manager for COMSOL 5.5 on Linux

Solution numéro: 1268 Se réfère à: COMSOL Multiphysics Versions: 5.6, 5.5

When trying to start the license manager for COMSOL Multiphysics 5.5 on my Linux computer, I receive the following error message: LMCOMSOL: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by LMCOMSOL) The ...

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Solving Complicated Models

Solution numéro: 1267 Versions: Toutes les 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 ...

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COMSOL crashes on startup after updating to Debian 10

Solution numéro: 1266 Versions: 5.4

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 ...

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Running COMSOL Multiphysics in an IPv6 Environment

Solution numéro: 1265 Se réfère à: COMSOL Multiphysics, COMSOL Server Versions: 6.2

I am attempting to install or update COMSOL from an Internet Protocol version 6 (IPv6) environment. I am unable to use online documentation and/or send emails from COMSOL to a IPv6-SMTP server. ##Installation: ...

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Memory Leak in the Fortran Runtime Libraries

Solution numéro: 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 ...

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The MUMPS Solver Crashes or Hangs During Cluster Simulation

Solution numéro: 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 ...

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Improving Convergence of Transient Models

Solution numéro: 1262 Versions: Toutes les 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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