Menu

COMSOL® SOFTWARE VERSION 6.3 UPDATE 2

Released May 27, 2025

The COMSOL® software version 6.3 update 2 (build 6.3.0.420) provides performance and stability improvements to COMSOL Multiphysics®, COMSOL Server™, COMSOL Client for use with COMSOL Server™, and Model Manager server.

The update applies to COMSOL® software version 6.3 (builds 6.3.0.290, 6.3.0.335).

The update is cumulative; that is, it includes the performance and stability improvements of version 6.3 update 1 (build 6.3.0.335). It can be applied directly to an installation of version 6.3 or 6.3 update 1.

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: Updates 1 and 2 to version 6.3 of the COMSOL® software do 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 and 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® 6.3 (build 6.3.0.420).

Updating COMSOL Server™

To update COMSOL Server™ for the Windows® operating system, run the Update program from the COMSOL Launchers folder in the Start menu. 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™ 6.3 (build 6.3.0.420).

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 6.3 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.

Updating Model Manager Server

To update Model Manager server for the Windows® operating system, run the Update program from the COMSOL Launchers folder in the Start menu. Note that the Model Manager server process needs to be stopped before applying the update.

For information on how to install the update, see the Additional Instructions tab below.

To check that the installation was successful, first make sure that Model Manager server is running; then, navigate to the Model Manager server in a web browser and follow the About link at the bottom of the page. The new version should be COMSOL Model Manager server 6.3 (Build: 6.3.0.420).

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 6.3 (build 6.3.0.290 or 6.3.0.335). 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 6.3 installation folder. The COMSOL Launchers folder can be found in the installation folder, for example, C:\Program Files\COMSOL\COMSOL63\Multiphysics\COMSOL Launchers.
    • Linux® operating systems: Run the update script from the COMSOL 6.3 installation directory, for example, /usr/local/comsol63/multiphysics.
    • macOS: Run the COMSOL Update application from the COMSOL 6.3 installation directory, for example, /Applications/COMSOL63/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 (2.6 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 6.3.0.420. (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 6.3 (build 6.3.0.290 or 6.3.0.335). 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 comsolserver63; 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 6.3 installation folder. The COMSOL Launchers folder can be found in the installation folder, for example, C:\Program Files\COMSOL\COMSOL63\Server\COMSOL Launchers.
    • Linux® operating systems: Run the update script from the COMSOL 6.3 installation directory, for example, /usr/local/comsol63/server.
    • macOS: Run the COMSOL Update application from the COMSOL 6.3 installation directory, for example, /Applications/COMSOL63/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 (2.6 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 comsolserver63; 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 6.3.0.420. (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 6.3 (build 6.3.0.290 or 6.3.0.335). 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 comsolmodelmanagerserver63; 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 6.3 installation folder. The COMSOL Launchers folder can be found in the installation folder, for example, C:\Program Files\COMSOL\COMSOL63\ModelManagerServer\COMSOL Launchers.
    • Linux® operating systems: Run the update script from the COMSOL 6.3 installation directory, for example, /usr/local/comsol63/ModelManagerServer.
    • macOS: Run the COMSOL Update application from the COMSOL 6.3 installation directory, for example, /Applications/COMSOL63/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 (212 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 comsolmodelmanagerserver63; 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 6.3.0.420. (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 6.3 (build 6.3.0.290 or 6.3.0.335). 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 (2.6 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\COMSOL63\Multiphysics
    installmode = update
    update.filepath = C:\Users\username\Downloads\comsol_6.3.0.420_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\COMSOL63\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/comsol63/multiphysics
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.3.0.420_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/comsol63/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/COMSOL63/Multiphysics
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.3.0.420_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/COMSOL63/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 6.3.0.420. (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 6.3 (build 6.3.0.290 or 6.3.0.335). 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 comsolserver63; 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 (2.6 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\COMSOL63\Server
    installmode = update
    update.filepath = C:\Users\username\Downloads\comsol_6.3.0.420_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\COMSOL63\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/comsol63/server
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.3.0.420_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/comsol63/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/COMSOL63/Server
    installmode = update
    update.filepath = /home/username/Downloads/comsol_6.3.0.420_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/COMSOL63/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 comsolserver63; 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 6.3.0.420. (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 6.3 (build 6.3.0.290 or 6.3.0.335). 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 comsolmodelmanagerserver63; 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 (212 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\COMSOL63\ModelManagerServer
    installmode = update
    update.filepath = C:\Users\username\Downloads\comsol_dbserver_6.3.0.420_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\COMSOL63\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/comsol63/modelmanagerserver
    installmode = update
    update.filepath = /home/username/Downloads/comsol_dbserver_6.3.0.420_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/comsol63/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/COMSOL63/ModelManagerServer
    installmode = update
    update.filepath = /home/username/Downloads/comsol_dbserver_6.3.0.420_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/COMSOL63/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 comsolmodelmanagerserver63; 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 6.3.0.420. (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, PowerPoint, and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. MATLAB and Simulink are registered trademarks of The MathWorks, Inc.

All COMSOL® software products undergo stability improvements that are introduced as updates. The following list contains the most important improvements in COMSOL® version 6.3 update 2 (and update 1).

COMSOL Multiphysics®

  • The Chatbot window now supports Azure OpenAI Service functionality.1
  • Significant improvements to the Geometry Cleanup functionality and the Merge Faces virtual operation1
  • Fixed an issue that resulted in black text on a black background when editing table cells while using a combination of dark theme in COMSOL Multiphysics® and high-contrast dark theme in Windows®1
  • External functions now produce an error when their names conflict with reserved names.1
  • Resolved an issue where COMSOL Multiphysics® would become unresponsive when evaluating a Function Switch containing a function branch that depended on a global or local user-defined function with the same node tag as the branch1
  • For the Moving Mesh and Deformed Geometry interfaces, the expressions defining the mesh displacement in a Prescribed Deformation node are now evaluated directly on boundaries when boundary coordinates are used. This change may yield different results compared to previous versions if the expressions involve variables that are discontinuous between the boundary and adjacent domains. Previously, the boundary displacement was determined by averaging the expressions evaluated in the adjacent domains.1
  • To improve performance when using load cases, the parametric solver now uses the Automatic option for the Parameter value run order. If this results in unexpected behavior, it is possible to use the old default value As specified instead.1
  • Dependent variables that are outputs from reduced-order models now consistently store the correct values, regardless of the order in which the outputs were listed in the Model Reduction node.1
  • For reduced-order models with linear outputs and input feedback, the output bias vector is now correctly computed when the inputs have nonzero training values.1
  • Random vibration operators are now compatible with the boundary flux computation option in the Discretization section of the Settings window for the relevant structural mechanics interfaces. This option becomes available when the Advanced Physics Options setting is enabled.1
  • The user interface for the Model Reduction study step has been simplified for the proper orthogonal decomposition (POD) method.1
  • The mapping of solution objects with extra data, such as previous solutions and left eigenvectors, has been improved for greater robustness. However, old solution objects may still contain corrupt data and cause internal errors when used. In such cases, it is recommended to recompute the solution.1
  • The performance for camera animations has been improved.1
  • Fixed a bug that prevented the use of Application Library Update on Linux® with libwebkit2gtk-4.1 or higher, e.g., on Ubuntu® 24.041
  • The license administration tool lmadmin has been removed from the installation set due to security vulnerabilities.1
  • Added proxy-server configuration support for the Chatbot window functionality2
  • Fixed a problem that prevented opening help documents on macOS2
  • Fixed an issue that prevented plotting Interpolation functions that use a function-dependent local table2
  • Faster processing of cumulative selections in large geometries2
  • The memory peak for the initialization of the implicit time-dependent solvers has been reduced, in particular when combined with the segregated nonlinear solver.2
  • Upgraded the optional AMD AOCL math library suite for AMD processors, improving performance for many models2
  • Added support for evaluating global and results parameters in kernel density estimation datasets2
  • Improved the positioning of 3D streamline plots for cases when the streamlines start from multiple boundaries2
  • Volume plots no longer need to be reevaluated when a succeeding plot feature in the plot group is enabled or disabled.2
  • Fixed a bug in the web browser plot rendering that made the plot disappear in some cases2
  • Fixed a bug in mouse selection when running an application in a web browser2
  • Fixed a bug that caused legend labels to disappear when running an application in a web browser2
  • In reports, all function names for user-defined functions with more than one function are now included.2
  • Reports of selection features in geometry sequences now include the selection type and selection entities or objects.2
  • Input selections for Virtual Operation geometry features are now included in reports.2
  • Improved report output for transposed Evaluation Group features2
  • Upgraded libvpx for the WebM video format2
  • Upgraded the Apache Tomcat® web interface software components2
  • Added a new set of examples demonstrating how to use selections and retrieve numerical data from models to the Application Programming Guide2
  • Security, performance, usability, and stability improvements1,2

Application Builder

  • Resolved an issue where ribbon sections in apps appeared enabled despite being initially disabled1
  • Fixed a bug that could prevent opening compiled model files for Java1
  • Form Editor performance improvement for apps with a large number of forms1
  • Updated the State-Space Controller add-in to fix layout issues2
  • Stability improvements1,2

Model Manager

  • Fixed an error that could occur in the References window in the Model Manager workspace when a file version was referenced both as an input file and as an output file by the same model version2
  • Upgraded the Apache Tomcat® web interface software components2
  • Upgraded the SQLite JDBC database access library2
  • Stability improvements1,2

Model Manager Server

  • Fixed an issue with launching a Model Manager server on Linux® systems with large page-size kernels, such as Ubuntu® arm64+largemem1
  • A Model Manager server now writes an error message on the command line and in the log file if the server fails to start due to an already occupied port.1
  • The displayed date in the web interface for a primitive attribute of value type Date no longer depends on the user's local time zone1
  • Upgraded the Apache Tomcat® web interface software components2
  • Upgraded the SQLite JDBC database access library2
  • Upgraded the PostgreSQL database server2
  • Upgraded the PostgreSQL JDBC driver (the Java connector software component)2
  • Stability improvements1,2

AC/DC Module

  • Added support for circular arrays of magnets so that the center coordinates are defined by parameters2
  • Stability improvements1,2

Acoustics Module

  • The stabilization expression and underlying formulation for the Pressure Acoustics, Boundary Elements interface have been enhanced to achieve faster convergence when solving models using an iterative approach. For models created in earlier versions, you can take advantage of this new formulation by manually updating the stabilization expression to abs(pabe.k[m]), which is the default for models created in version 6.3 update 1 and later.1
  • For models using the Pressure Acoustics, Time Explicit interface that are solved with the accelerated GPU formulation, certain combinations of Impedance boundary condition assignments and domain selections were causing numerical inaccuracies. This issue has been resolved.1
  • In models using the Thermoviscous Acoustics interface, the performance of the suggested iterative solver that uses domain decomposition has been improved by optimization of the solver settings.1
  • The Acoustic–Structure Boundary, Time Explicit multiphysics coupling can now also be coupled to poroacoustics domains in the Pressure Acoustics, Time Explicit interface.2
  • Stability improvements1,2

Battery Design Module

  • Stability improvements1,2

CAD Import Module

  • Added support for importing ACIS® 2025 1.0 and SOLIDWORKS® 2025 files on Windows® and Linux®1
  • Stability improvements1

CFD Module

  • New default solver settings for stationary fluid flow simulations provide substantial solution-time reductions in a majority of cases. The new settings are applied to the solver sequence when a Stationary study or Stationary study step is added, when the solver configurations are reset to their defaults, and to existing stationary studies for which the Solver Configurations node has not been edited.1
  • The External Slip Wall, Slip Wall, and Interior Wall features of the Slip Flow interface have been equipped with a new Constraint Settings section providing the options Weak constraints (default) and Nitsche constraints. The Weak constraints option corresponds to the already existing functionality, while the Nitsche constraints option is newly implemented for the interface. Nitsche constraints work well with iterative solvers, give better results in the corner points and ends of the interior walls, and are generally more stable.2
  • In the 2D axisymmetric high Mach number flow interfaces, the Subsonic flow condition for inlets now includes an input field for the out-of-plane velocity component when swirl flow is active.2
  • Improved the Mixing Plane feature's handling of tangential flows by using a formulation based on Nitsche's method that includes constraints on tangential velocity components2
  • Stability improvements1,2

Chemical Reaction Engineering Module

  • Warnings from various coupling features are now only shown when the affected equations are solved.1
  • A warning is now shown when mass transport equations in nonconservative form are coupled with a compressible fluid flow for the Reacting Flow, Diluted Species and Precipitation in Fluid Flow coupling features.1
  • Reintroduced the Reaction node for the Transport of Concentrated Species interface, implementing a single reaction in laminar or turbulent flow2
  • Initial conditions, boundary conditions, and diffusion coefficients defined using a size-dependent expression in the Size-Based Population Balance interface now use the exact interval midpoint sizes to achieve a more accurate discrete representation of the entered expression.2
  • Stability improvements1,2

Composite Materials Module

  • Stability improvements1,2

Corrosion Module

  • Stability improvements1

Design Module

  • Stability improvements1,2

ECAD Import Module

  • Stability improvements1

Electric Discharge Module

  • Improved variable definitions for the field electron emission of the Electrode feature in the Electric Discharge interface1
  • Corrected an error in the expression for the photon intensity in the Photoionization feature in the Electric Discharge interface2
  • Stability improvements1

Electrochemistry Module

  • Stability improvements1

Electrodeposition Module

  • Stability improvements2

Geomechanics Module

  • Stability improvements1,2

Heat Transfer Module

  • The Fluence Rate Calculation feature can now be used with the Symmetry for Surface-to-Surface Radiation feature.2
  • Stability improvements1,2

Liquid & Gas Properties Module

  • Stability improvements2

LiveLink™ for Inventor®

  • Stability improvements1,2

LiveLink™ for MATLAB®

  • mphmatrix now supports complex values for the parameter 'eigref'.2
  • Stability improvements1,2

  • Stability improvements2

LiveLink™ for Revit®

  • Stability improvements1

Metal Processing Module

  • Stability improvements1

Multibody Dynamics Module

  • Stability improvements2

Nonlinear Structural Materials Module

  • Stability improvements1,2

Optimization Module

  • Performance improvements for control functions and transient optimizations1
  • Stability improvement to preserve normal continuity between polynomial boundaries in shape optimizations2
  • Fixed an issue where Least-Squares Objective features did not display the parameter units correctly2
  • Stability improvements for the Transformation shape optimization feature's Rotation type options: Free rotation and Axis in plane2
  • Stability improvements1,2

Pipe Flow Module

  • Stability improvements1

Polymer Flow Module

  • Stability improvements2

RF Module

  • Stability improvements1,2

Rotordynamics Module

  • Stability improvements1

Semiconductor Module

  • Fixed a bug where a spurious warning appeared for the WKB Tunneling Model, Electrons and WKB Tunneling Model, Holes features1

Structural Mechanics Module

  • Fixed an out-of-memory error that could occur when a Layered Shell interface and a contact feature were simultaneously present1
  • Fixed an issue with the automatic generation of material tests from the Test Material node when a Solid Mechanics interface or a Material Model subnode uses manual domain selections1
  • Settings in Mass and Moment of Inertia subnodes of the Rigid Connector, Rigid Material, and gear nodes are now correctly taken into account in inertia relief analyses.2
  • Fixed a bug that caused the phase factor to be applied twice for some load variables2
  • Stability improvements1,2

Uncertainty Quantification Module

  • Fixed a license handling issue occurring when running the Uncertainty Quantification Module using a batch license with a single-seat floating network license (FNL)2
  • Added support for evaluating global and results parameters in kernel density estimation datasets2
  • Stability improvements1,2

Wave Optics Module

  • Disabled undo functionality when adding more than 100 subnodes to periodic ports to avoid excessive Java heap space usage2
  • Stability improvements1,2

1 New in update 1 (build 6.3.0.335, released January 23, 2025)

2 New in update 2 (build 6.3.0.420, released May 27, 2025)

ACIS is a registered trademark of Spatial Corporation. Autodesk, the Autodesk logo, Inventor, and Revit are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA 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. SOLIDWORKS is a registered trademark of Dassault Systèmes. SolidWorks Corp. Ubuntu is a registered trademark of Canonical Ltd.