COMSOL® SOFTWARE VERSION 6.1 UPDATE 2.1

Released March 29, 2023

The COMSOL® software version 6.1 update 2.1 (build 6.1.0.357) provides performance and stability improvements to COMSOL Multiphysics®, COMSOL Server™, and COMSOL Client.

The update applies to version 6.1 of the COMSOL® software (builds 6.1.0.252, 6.1.0.282, and 6.1.0.346). The update is cumulative; that is, it includes the performance and stability improvements of version 6.0 update 1 and update 2 (build 6.1.0.346). It can be applied directly to an installation of version 6.1 or 6.1 update 1, or 6.1 update 2.

If you have a version older than version 6.1 and a valid license with a current subscription, you can apply update 2.1 by performing a full installation of version 6.1 from the Product Download page, which will include all updates.

Terms and Conditions

This update is governed by the COMSOL Software License Agreement that is displayed upon installation of COMSOL Multiphysics® or by the terms and conditions of any other agreement COMSOL may have with your organization. For the latest version of the COMSOL Software License Agreement, including any provisions applicable to this update, see the License Agreements page. By downloading and using this update, you agree to use this update in accordance with the current version of the COMSOL Software License Agreement or with the terms and conditions of any other agreement we may have with your organization.

Note: Update 1, update 2, and update 2.1 to version 6.1 of the COMSOL® software did not introduce any changes to the COMSOL Software License Agreement.

How to Apply the Software Update

Before proceeding with your installation, make sure that you close and exit any running COMSOL® processes or any software you have running that correlates to a LiveLink™ product you would like to update (Excel®, MATLAB®, Simulink®, or a CAD software program).

Updating COMSOL Multiphysics®

The easiest way to install the update for COMSOL Multiphysics® is to start the program and then select Check for Product Updates. If using the Windows® operating system, this option is located in the File menu under Help. If using the Linux® operating system or macOS, this option is located in the Help menu.

For more information on how to install the update and for offline installation instructions, see the Additional Instructions tab below.

To check that the update installation was successful, first start the COMSOL Multiphysics® software and then select the About COMSOL Multiphysics menu option. If using the Windows® operating system, this option is located in the File menu under Help. If using the Linux® operating system or macOS, this option is located in the Help menu. The listed version should be COMSOL Multiphysics® 6.1 (build 357).

Updating COMSOL Server™

To update COMSOL Server™ if using the Windows® operating system, run the Update program from the COMSOL Launchers folder in the Startmenu. Note that the COMSOL Server™ service process needs to be stopped before applying the update.

For more information on how to install the update, installing on other operating systems, and offline installation, see the Additional Instructions tab below.

To check that the installation was successful, first make sure that COMSOL Server™ is running; then, navigate to COMSOL Server™ in a web browser and follow the About COMSOL Server™ link in the lower-right corner. The new version should be COMSOL Server™ 6.1 (build 357).

Updating COMSOL Client for Use with COMSOL Server™

To update COMSOL Client for the Windows® operating system, download the new version from Client Download and install. The previous 6.1 installation will be overwritten. In order to run properly, your installation of COMSOL Client must have the same version number as the COMSOL Server™ installation that you connect to.

The following instructions apply only if you are not using the method based on the Check for Product Updates menu item, as described above.

Updating COMSOL Multiphysics®

1

Check the Version Number

  1. Start COMSOL Multiphysics®.
  2. Open the About COMSOL Multiphysics dialog box. If using the Windows® operating system, the dialog box can be found in the File menu under Help. If using either the Linux® operating system or macOS, the dialog box can be found under the Help menu.
  3. Check that the version number is 6.1 (builds 6.1.0252, 6.1.0.282, and 6.1.0.346). This corresponds to the version that has not yet been updated.
2

Install the Update

Before you proceed with the installation, make sure to exit any running COMSOL Multiphysics® processes or any software you have running that correlates to a LiveLink™ product you would like to update (Excel®, PowerPoint®, MATLAB®, or a CAD software).

  1. Start the COMSOL® software update installer:
    • Windows® operating systems: Run the Update program from the COMSOL Launchers folder in the Start menu, or directly from the COMSOL 6.1 installation folder. The COMSOL Launchers folder can be found in the installation folder, for example, C:\\Program Files\\COMSOL\\COMSOL61\\Multiphysics\\COMSOL Launchers.
    • Linux® operating systems: Run the update script from the COMSOL 6.1 installation directory, for example, /usr/local/comsol61/multiphysics.
    • macOS: Run the COMSOL Update application from the COMSOL 6.1 installation directory, for example, /Applications/COMSOL61/Multiphysics.
  2. The next step will be taken in the installer program\'s Options page and depends on whether or not you have a live internet connection or if you plan to download the update file for offline installation:
    • If you have an internet connection: Keep the Direct download setting.
    • If you have an internet connection via a proxy server: Select Download via proxy server and enter your proxy configuration settings.
    • If you do not have an internet connection on the target computer or if you want to apply the update several times on multiple computers: Download the following file to a folder on your computer
      DOWNLOAD UPDATE (1.87 GB)
      In the installer program, select Manual download and click Browse. Navigate to the downloaded file and click Open.
  3. Click Next to get to the Release Notes page for reviewing the update details.
  4. Click Next to get to the Install page and review the software components affected by the update.
  5. In the Install page, click Install to start the installation of the update.
3

Check the Installation

  1. Start COMSOL Multiphysics®.
  2. Open the About COMSOL Multiphysics dialog box. If using the Windows® operating system, this is located in the File menu under Help. If using the Linux® operating system or macOS, this is located in the Help menu.
  3. Check that the version number is 6.1 (build 6.1.0.357). (If not, the installation did not succeed.)

Updating COMSOL Server™

1

Check the Version Number

  1. Navigate to the running version of COMSOL Server™ in a web browser.
  2. Click the About COMSOL Server link in the lower-right corner.
  3. Check that the version number is 6.1 (builds 6.1.0252, 6.1.0.282, and 6.1.0.346). This corresponds to the version that has not yet been updated.
2

Stop the COMSOL Server™ Processes

Before you proceed with the installation, make sure to stop any running COMSOL Server™ processes.

  1. In Windows®: Stop the server by either typing close, if COMSOL Server™ is running in a command window, or by running the Stop COMSOL Server shortcut from the COMSOL Launchers folder in the start menu, if COMSOL Server™ is installed as a Windows® service.
  2. In Linux®: If you configured COMSOL Server™ using the systemd service, stop it by typing systemctl stop comsolserver61; otherwise, kill the COMSOL Server™ process.
  3. In macOS: Kill the COMSOL Server™ process.
3

Install the Update

Before you proceed with the installation, make sure to stop any running COMSOL Server™ processes, as described above.

  1. Start the COMSOL® software update installer:
    • Windows® operating systems: Run the Update program from the COMSOL Launchers folder in the Start menu, or directly from the COMSOL 6.1 installation folder. The COMSOL Launchers folder can be found in the installation folder, for example, C:\\Program Files\\COMSOL\\COMSOL61\\Server\\COMSOL Launchers.
    • Linux® operating systems: Run the update script from the COMSOL 6.1 installation directory, for example, /usr/local/comsol61/server.
    • macOS: Run the COMSOL Update application from the COMSOL 6.1 installation directory, for example, /Applications/COMSOL61/Server.
  2. The next step will be taken in the installer program\'s Options page and depends on whether or not you have a live internet connection or if you plan to download the update file for offline installation:
    • If you have an internet connection: Keep the Direct download setting.
    • If you have an internet connection via a proxy server: Select Download via proxy server and enter your proxy configuration settings.
    • If you do not have an internet connection on the target computer or if you want to apply the update several times on multiple computers: Download the following file to a folder on your computer
      DOWNLOAD UPDATE (1.87 GB)
      In the installer program, select Manual download and click Browse. Navigate to the downloaded file and click Open.
  3. Click Next to get to the Release Notes page for reviewing the update details.
  4. Click Next to get to the Install page and review the software components affected by the update.
  5. In the Install page, click Install to start the installation of the update.
4

Start COMSOL Server™ Again

  • In Windows®: Start COMSOL Server™ by using the COMSOL Server shortcut in the start menu. Alternatively, if COMSOL Server™ was installed as a Windows® service, start it by using the Start COMSOL Server shortcut.
  • In Linux®: If you configured COMSOL Server™ using the systemd service, start it by typing systemctl start comsolserver61; otherwise, type <installation directory>/bin/comsol server to start COMSOL Server™.
  • In macOS: Type <installation directory>/bin/comsol server to start COMSOL Server™.
5

Check the Installation

  1. Navigate to the running version of COMSOL Server™ in a web browser.
  2. Click the About COMSOL Server link in the lower-right corner
  3. Check that the version number is 6.1 (build 6.1.0.357). (If not, the installation did not succeed.)

Updating Model Manager Server

1

Check the Version Number

  1. Navigate to the running version of Model Manager server in a web browser.
  2. Click the About link in the center of the footer.
  3. Check that the version number is 6.1 (builds 6.1.0252, 6.1.0.282, and 6.1.0.346). This corresponds to the version that has not yet been updated.
2

Stop the Model Manager Server Processes

Before you proceed with the installation, make sure to stop any running Model Manager server processes.

  1. In Windows®: Stop the server by either typing Ctrl+C, if Model Manager server is running in a command window or by running the Stop Model Manager Server shortcut from the COMSOL Launchers folder in the start menu, if Model Manager server is installed as a Windows® service.
  2. In Linux®: If you configured Model Manager server using the systemd service, stop it by typing systemctl stop comsolmodelmanagerserver61; otherwise, kill the Model Manager server process.
  3. In macOS: Kill the Model Manager server process.
3

Install the Update

Before you proceed with the installation, make sure to stop any running Model Manager server processes, as described above.

  1. Start the COMSOL® software update installer:
    • Windows® operating systems: Run the Update program from the COMSOL Launchers folder in the Start menu, or directly from the COMSOL 6.1 installation folder. The COMSOL Launchers folder can be found in the installation folder, for example, C:\\Program Files\\COMSOL\\COMSOL61\\ModelManagerServer\\COMSOL Launchers.
    • Linux® operating systems: Run the update script from the COMSOL 6.1 installation directory, for example, /usr/local/comsol61/ModelManagerServer.
    • macOS: Run the COMSOL Update application from the COMSOL 6.1 installation directory, for example, /Applications/COMSOL61/ModelManagerServer.
  2. The next step will be taken in the installer program\'s Options page and depends on whether or not you have a live internet connection or if you plan to download the update file for offline installation:
    • If you have an internet connection: Keep the Direct download setting.
    • If you have an internet connection via a proxy server: Select Download via proxy server and enter your proxy configuration settings.
    • If you do not have an internet connection on the target computer or if you want to apply the update several times on multiple computers: Download the following file to a folder on your computer
      DOWNLOAD UPDATE (42 MB)
      In the installer program, select Manual download and click Browse. Navigate to the downloaded file and click Open.
  3. Click Next to get to the Release Notes page for reviewing the update details.
  4. Click Next to get to the Install page and review the software components affected by the update.
  5. In the Install page, click Install to start the installation of the update.
4

Start Model Manager Server Again

  • In Windows®: Start Start Model Manager server by using the Model Manager Server shortcut in the start menu. Alternatively, if Model Manager server was installed as a Windows® service, start it by using the Start Model Manager Server shortcut.
  • In Linux®: If you configured Model Manager server using the systemd service, start it by typing systemctl start comsolmodelmanagerserver61; otherwise, type <installation directory>/bin/comsol modelmanagerserver to start Model Manager server.
  • In macOS: Type <installation directory>/bin/comsol modelmanagerserver to start Model Manager server.
5

Check the Installation

  1. Navigate to the running version of Model Manager server in a web browser.
  2. Click the About link in the center of the footer.
  3. Check that the version number is 6.1 (build 6.1.0.357). (If not, the installation did not succeed.)

Setting up Automated Installation of the Update

If you do not have access to the graphical user interface of your operating system or if you want to automate the update process, you can follow the steps below.

Automated Update of COMSOL Multiphysics®

1

Check the Version Number

  1. Start COMSOL Multiphysics®.
  2. Open the About COMSOL Multiphysics dialog box. If using the Windows® operating system, the dialog box can be found in the File menu under Help. If using either the Linux® operating system or macOS, the dialog box can be found under the Help menu.
  3. Check that the version number is 6.1 (builds 6.1.0252, 6.1.0.282, and 6.1.0.346). This corresponds to the version that has not yet been updated.
2

Download the Update File

Click the button below to download the update. In some browsers, such as the Internet Explorer® browser, a dialog box will then open where you can click Save directly after the download has occurred.

DOWNLOAD UPDATE (1.87 GB)

3

Installation

Before you proceed with the installation, make sure you have closed any COMSOL sessions or stopped any running COMSOL processes or any software you have running that correlates to a LiveLink™ product you would like to update (Excel®, MATLAB®, or a CAD software).

Windows® Operating Systems

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = C:\\Program Files\\COMSOL\\COMSOL61\\Multiphysics
    installmode = update
    update.filepath = C:\\Users\\username\\Downloads\\comsol_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Run cmd. Start the setup program (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: C:\\Program Files\\COMSOL\\COMSOL61\\Multiphysics\\setup.exe -s C:\\Users\\username\\setupconfig.ini

Linux® Operating Systems

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = /usr/local/comsol61/multiphysics
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Start the setup script (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: /usr/local/comsol61/multiphysics/setup -s /home/username/setupconfig.ini

macOS

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = /Applications/COMSOL61/Multiphysics
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Start the setup script (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: /Applications/COMSOL61/Multiphysics/setup -s /home/username/setupconfig.ini

4

Check the Installation

  1. Start COMSOL Multiphysics®.
  2. Open the About COMSOL Multiphysics dialog box. If using the Windows® operating system, this is located in the File menu under Help. If using the Linux® operating system or macOS, this is located in the Help menu.
  3. Check that the version number is 6.1 (build 6.1.0.357). (If not, the installation did not succeed.)

Automated Update of COMSOL Server™

1

Check the Version Number

  1. Navigate to the running version of COMSOL Server™ in a web browser.
  2. Click the About COMSOL Server link in the lower-right corner.
  3. Check that the version number is 6.1 (builds 6.1.0252, 6.1.0.282, and 6.1.0.346). This corresponds to the version that has not yet been updated.
2

Stop the COMSOL Server™ Processes

Before you proceed with the installation, make sure to stop any running COMSOL Server™ processes.

  1. In Windows®: Stop the server by either typing close, if COMSOL Server™ is running in a command window, or by running the Stop COMSOL Server shortcut from the COMSOL Launchers folder in the start menu, if COMSOL Server™ is installed as a Windows® service.
  2. In Linux®: If you configured COMSOL Server™ using the systemd service, stop it by typing systemctl stop comsolserver61; otherwise, kill the COMSOL Server™ process.
  3. In macOS: Kill the COMSOL Server™ process.
3

Download the Update File

Click the button below to download the update. In some browsers, such as the Internet Explorer® browser, a dialog box will then open where you can click Save directly after the download has occurred.

DOWNLOAD UPDATE (1.87 GB)

4

Installation

Before you proceed with the installation, make sure you have closed any COMSOL sessions or stopped any running COMSOL processes or any software you have running that correlates to a LiveLink™ product you would like to update (Excel®, MATLAB®, or a CAD software).

Windows® Operating Systems

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = C:\\Program Files\\COMSOL\\COMSOL61\\Server
    installmode = update
    update.filepath = C:\\Users\\username\\Downloads\\comsol_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Run cmd. Start the setup program (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: C:\\Program Files\\COMSOL\\COMSOL61\Server\\setup.exe -s C:\\Users\\username\\setupconfig.ini

Linux® Operating Systems

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = /usr/local/comsol61/server
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Start the setup script (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: /usr/local/comsol61/server/setup -s /home/username/setupconfig.ini

macOS

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = /Applications/COMSOL61/Server
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Start the setup script (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: /Applications/COMSOL61/Server/setup -s /home/username/setupconfig.ini

5

Start COMSOL Server™ Again

  • In Windows®: Start COMSOL Server™ by using the COMSOL Server shortcut in the start menu. Alternatively, if COMSOL Server™ was installed as a Windows® service, start it by using the Start COMSOL Server shortcut.
  • In Linux®: If you configured COMSOL Server™ using the systemd service, start it by typing systemctl start comsolserver61; otherwise, type <installation directory>/bin/comsol server to start COMSOL Server™.
  • In macOS: Type <installation directory>/bin/comsol server to start COMSOL Server™.
6

Check the Installation

  1. Navigate to the running version of COMSOL Server™ in a web browser.
  2. Click the About COMSOL Server link in the lower-right corner
  3. Check that the version number is 6.1 (build 6.1.0.357). (If not, the installation did not succeed.)

Automated Update of the Model Manager Server

1

Check the Version Number

  1. Navigate to the running version of Model Manager server in a web browser.
  2. Click the About link in the center of the footer.
  3. Check that the version number is 6.1 (builds 6.1.0252, 6.1.0.282, and 6.1.0.346). This corresponds to the version that has not yet been updated.
2

Stop the Model Manager Server Processes

Before you proceed with the installation, make sure to stop any running Model Manager server processes.

  1. In Windows®: Stop the server by either typing Ctrl+C, if Model Manager server is running in a command window or by running the Stop Model Manager Server shortcut from the COMSOL Launchers folder in the start menu, if Model Manager server is installed as a Windows® service.
  2. In Linux®: If you configured Model Manager server using the systemd service, stop it by typing systemctl stop comsolmodelmanagerserver61; otherwise, kill the Model Manager server process.
  3. In macOS: Kill the Model Manager server process.
3

Download the Update File

Click the button below to download the update. In some browsers, such as the Internet Explorer® browser, a dialog box will then open where you can click Save directly after the download has occurred.

DOWNLOAD UPDATE (42 MB)

4

Installation

Before you proceed with the installation, make sure you have closed any COMSOL sessions or stopped any running COMSOL processes or any software you have running that correlates to a LiveLink™ product you would like to update (Excel®, MATLAB®, or a CAD software).

Windows® Operating Systems

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = C:\\Program Files\\COMSOL\\COMSOL61\\ModelManagerServer
    installmode = update
    update.filepath = C:\\Users\\username\\Downloads\\comsol_dbserver_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Run cmd. Start the setup program (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: C:\\Program Files\\COMSOL\\COMSOL61\\ModelManagerServer\\setup.exe -s C:\\Users\\username\\setupconfig.ini

Linux® Operating Systems

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = /usr/local/comsol61/modelmanagerserver
    installmode = update
    update.filepath = /home/username/Downloads/comsol_dbserver_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Start the setup script (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: /usr/local/comsol61/modelmanagerserver/setup -s /home/username/setupconfig.ini

macOS

  1. Create a file named setupconfig.ini in your home directory, or anywhere else you have write permission.

  2. Copy the following lines to setupconfig.ini
    installdir = /Applications/COMSOL61/ModelManagerServer
    installmode = update
    update.filepath = /home/username/Downloads/comsol_dbserver_6.1.0.357_update.dat

  3. Change installdir path to the target COMSOL installation. Change update.filepath to the path where the manual update file is located.

  4. Start the setup script (located in the COMSOL install directory) with the flag -s and the path to your setupconfig.ini file. Example: /Applications/COMSOL61/modelmanagerserver/setup -s /home/username/setupconfig.ini

5

Start Model Manager Server Again

  • In Windows®: Start Model Manager server by using the Model Manager server shortcut in the start menu. Alternatively, if Model Manager server was installed as a Windows® service, start it by using the Start Model Manager server shortcut.
  • In Linux®: If you configured Model Manager server using the systemd service, start it by typing systemctl start comsolmodelmanagerserver61; otherwise, type <installation directory>/bin/comsol modelmanagerserver to start Model Manager server.
  • In macOS: Type <installation directory>/bin/comsol modelmanagerserver to start Model Manager server.
6

Check the Installation

  1. Navigate to the running version of Model Manager server in a web browser.
  2. Click the About link in the center of the footer.
  3. Check that the version number is 6.1 (build 6.1.0.357). (If not, the installation did not succeed.)

Linux is a registered trademark of Linus Torvalds in the U.S. and other countries. macOS is a trademark of Apple Inc., registered in the U.S. and other countries. Microsoft, Internet Explorer, Excel, and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. MATLAB is a registered trademark of The MathWorks, Inc.

All COMSOL® software products undergo performance and stability improvements that are introduced as updates. The following list contains the most important improvements in COMSOL® version 6.1 update 2.1.

COMSOL Multiphysics®

  • Improved performance for large tables on macOS and Linux®2
  • Eliminated spurious hits in the Application Libraries search caused by index word boundaries not being respected2
  • Fixed an issue where searches of the Application Libraries using scope-limiting "@-" prefixes could return erroneous results2
  • Argument units for the least-squares fit and Gaussian process functions introduced in version 6.1 are now handled correctly when the unit for an argument column is set to an empty string and a previous argument column has a nonempty unit. Now, the function argument always becomes dimensionless if the unit is specified as an empty string, regardless of units for previous arguments to the function. For functions used in already-computed studies, updating the solution is required to obtain the corrected function definition to be used in the solution. If the argument unit that was deduced in 6.1 or 6.1 update 1 is actually wanted, change the unit expression to the actual wanted unit instead of leaving it blank.2
  • Fixed an issue where connecting to a Model Manager server failed if the Windows-ROOT truststore was used for COMSOL Multiphysics®2
  • It is now possible to use the Least-Squares Fit function without any add-on products1
  • Improved performance for the withsol operator on domains with many mesh elements1
  • Improved error messages for duplicate user-defined variables1
  • Improved the All option for extra time steps in Particle Trajectories and Ray Trajectories plots1
  • Fixed an issue in the linearization of nonlinear terms involving time derivatives in eigenvalue computations that previously could have influenced calculated eigenvalues1
  • The splash screen for the COMSOL Documentation application has been updated to display the correct version number1
  • Fixed a problem where the toolbars in plot windows of a COMSOL Multiphysics® server were not displaying properly1
  • Fixed a problem where the toolbar in the Graphics window would sometimes disappear when selecting a component node after having selected a plot group1
  • Dragging sliders is now possible on Ubuntu® 22.041
  • Fixed an issue where COMSOL Client did not refresh the Application Library properly1
  • The report output for Study and Solver nodes has been modified to better match the layout of the COMSOL Desktop® Settings windows1
  • Corrected the warning given when a time-dependent, modal, reduced-order model is trained with a nonlinear or explicitly time-dependent output expression1
  • Improved performance for the discontinuous Galerkin (dG) method on clusters1
  • Fixed an issue where performing mesh adaptation on a subset of domains when a physics interface is defined on a different subset could lead to an error1
  • Memory usage has been reduced for computational fluid dynamics (CFD) modeling on clusters when using default iterative linear solvers1
  • The equation display in partial different equation (PDE) interfaces now follows the equation form1
  • Improved the automatic selection of which geometric entities to keep and which to remove when not explicitly defined1
  • Improved performance in geometry analysis for large imported meshes with many geometric entities1
  • Improved the automatic selection of which geometric entities to keep and which to remove when an entity is collapsed1
  • Proxy-server preference settings are used when checking for and downloading product updates1
  • The context menu under Results to add a predefined plot directly has been removed. Instead, you can now open the Add Predefined Plot window from the context menu under Results1
  • Stability improvements1,2
  • Performance improvements1,2
  • Security improvements1,2

Application Builder

  • Added Method Editor code-completion support for multiphysics couplings1
  • Fixed a problem where sections were unexpectedly expanded or collapsed in Settings Forms1
  • onLoad and onClose events are now triggered for local forms in form collections1

AC/DC Module

  • Fixed a problem that occurred when trying to solve a coupled time-dependent model with a Magnetic and Electric Fields interface and an Electrical Circuit interface2
  • Smoother normB fields on axes in 2D axisymmetric models1

Acoustics Module

  • Fixed the equation display in the Aeroacoustic Flow Source settings2
  • Corrected the solver configuration for Thermoviscous Acoustics, Transient models that include Lumped Speaker Boundary features2
  • Momentum and mass conservation contributions have been added for acoustic streaming models where thermoviscous acoustics is coupled with fluid flow for models that have an inlet, outlet, open boundary, or stress boundary1
  • An error in the formulation of the Komatsu option for the Delany–Bazley–Miki model in the Poroacoustics interface has been fixed1

Battery Design Module

  • On the Batteries node in the Battery Pack interface, the input has been changed from Battery pack capacity to Initial battery cell capacity1

CAD Import Module

  • Support has been added for importing ACIS® 2023 1.0 and SOLIDWORKS® 2023 files on Windows®2
  • The Parasolid® libraries used in the CAD kernel and in the import and export of CAD files have been upgraded on Windows® and Linux®1
  • In versions 6.0 and 6.1, the STEP file import did not import layer attributes as boundary selections. This has now been fixed on Windows® and Linux®.1

CFD Module

  • Corrected the normal direction used for the mesh velocity in Free Surface features when applied to interior boundaries of a geometry2
  • Fixed a bug where all Wall features in a new interface had the same Wall condition (No slip/Slip) as the last Wall feature in the original interface1
  • Updated the mesh sequence for the oneram6wing.mph model2

Chemical Reaction Engineering Module

  • Using a Reaction Engineering interface, the species molar mass is now automatically computed and displayed when the species name corresponds to a valid chemical formula2
  • Stability improvements2

File Import for CATIA® V5

  • Support has been added for importing CATIA® V5 2023 files on Windows®2

Geomechanics Module

  • The plastic potential of the Hardening Soil model has been corrected for the general three-dimensional stress state1
  • The plastic shear-strain hardening variable has been corrected for the Hardening Soil material model1

Heat Transfer Module

  • Fixed the error occurring in the Surface-to-Surface Radiation physics interface in 1D and 1D axisymmetric when British engineering units are used for the model2
  • Added support for using the Moisture Flow multiphysics coupling with the Transport in Porous Media and Darcy's Law interfaces2

Liquid & Gas Properties Module

  • Stability improvements2

LiveLink™ for PTC Creo Parametric™

  • Support has been added for PTC Creo Parametric™ 9.0 3

RF Module

  • For improved stability, the filtering strategy has been changed. Now, even when the Activate check box in the Filter Parameters section in the Wave Equations settings is cleared, there will be filtering in all domains. For Absorbing Layer domains, the alpha, eta, and s parameters are 0.5, 0.1, and 4, respectively. For regular domains (not Absorbing Layer domains), the alpha parameter is 0.05, whereas the other parameters are the same as for Absorbing Layer domains. Filtering can be turned off by setting all filter parameters to NaN or by setting the eta parameter to 1.2

Structural Mechanics Module

  • The default constraint method for shell normal constraints as defined in the Advanced Settings section of the Shell interface has been changed to Nodal. (Previously, the default method was Elemental.)2
  • An error was corrected for the Bolt Pretension feature in the Solid Mechanics interface. The bolt force variables used for visualization and results evaluation was wrong if a unit system with a force unit other than newton (N) was used2
  • The override rules for the Spring Foundation node in the Solid Mechanics interface in 1D and 1D axisymmetry have been improved1
  • The boundary conditions for biaxial and shear tests in the Test Material feature have been corrected1
  • It is now possible to use the Lumped-Structure Connection multiphysics coupling in 1D1 par
  • Reaction moments are now dynamically recomputed when changing the reference point for moment calculation in the Parameters section of a plot node. This applies to the Beam, Pipe Mechanics, Beam Rotor, Truss, and Wire interfaces1
  • The definition of section forces and moments in the Pipe Mechanics interface has been improved for flexibility analyses. This improvement includes stiffness corrections using the Bend subnode.1
  • Load contributions from Added Mass and Point Mass in the Beam interface are now treated correctly1

Subsurface Flow Module

  • The Thin Barrier boundary condition and the Fracture feature with the Fracture model set to Thin conducting barrier can now be used within the same COMSOL model1

Wave Optics Module

  • When using structured meshes for the Electromagnetic Waves, Beam Envelopes interface, the generated mesh has been improved by the inclusion of more Distribution nodes where needed1

1 New in update 1 (build 6.1.0.282, released on Dec 15, 2022)

2 New in update 2 (build 6.1.0.346, released on March 15, 2023

3 New in update 2.1 (build 6.1.0.357, released on March 29, 2023)

ACIS is a registered trademark of Spatial Corporation. CATIA is a registered trademark of Dassault Systèmes or its subsidiaries in the US and/or other countries. Linux is a registered trademark of Linus Torvalds in the U.S. and other countries. macOS is a trademark of Apple Inc., in the U.S. and other countries. MATLAB and Simulink are registered trademarks of The MathWorks, Inc. Microsoft, Excel, and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Parasolid is a trademarks or registered trademark of Siemens Product Lifecycle Management Software Inc. or its subsidiaries in the United States and in other countries. PTC, Creo, and Creo Parametric are trademarks or registered trademarks of PTC Inc. or its subsidiaries in the U.S. and in other countries.SOLIDWORKS is a registered trademark of Dassault Systèmes SolidWorks Corp. Ubuntu is a registered trademark of Canonical Ltd.