COMSOL 4.3a Update 1

Released December 5, 2012.

For update details, click this link:
Update Details.

Important Notice for LiveLink™ for Excel® Users

The update for LiveLink for Excel must be applied separately.

If you previously installed LiveLink™ for Excel®, for Excel 2010, then begin with uninstalling it. To uninstall: open the Control Panel, select Uninstall a program. In the list, right-click COMSOL 4.3a - LiveLink for Excel and select Uninstall.

Install the update by clicking on one of the following links.
Note: When installing with Excel 2007, make sure to select Just me under the Select Installation Option.
comsol_4.3.1.161_llexcel_win32.exe (for 32-bit Windows)
comsol_4.3.1.161_llexcel_win64.exe (for 64-bit Windows)

Automatic Installation


Start COMSOL Multiphysics. In the Help menu, select Check for Updates. If a COMSOL Update is available, click Download

Linux and Mac

Start COMSOL Multiphysics. In the Help menu, select Check for Updates. If a COMSOL Update is available, you need to first exit COMSOL Multiphysics. Start a shell and cd to the root of the COMSOL 4.3a installation. As root or with sudo priviliges, type setup/setup update.

Manual Installation

Check your version

Make sure that you run COMSOL version or later. On the Help menu, click About COMSOL Multiphysics to check your version. If you have an earlier build number, contact your COMSOL sales representative to get the official release of COMSOL 4.3a before you proceed.

Download Update

Bullet Windows comsol_4.3.1.161_win.exe 164.9 MB
Bullet Linux 189.7 MB
Bullet Mac OS X comsol_4.3.1.161_mac.dmg 182.8 MB

If you have a license for LiveLink™ for MATLAB®, also download the additional update for this product

Bullet Windows comsol_4.3.1.155_mli_win.exe 392 KB
Bullet Linux 6 KB
Bullet Mac OS X comsol_4.3.1.155_mli_mac.dmg 41 KB

If you have a license for LiveLink™ for Inventor®, download also the additional update for this product

Bullet Windows comsol_4.3.1.161_llinv_win.exe 520 KB

If you have a license for LiveLink™ for Solid Edge®, download also the additional update for this product

Bullet Windows comsol_4.3.1.155_llse_win.exe 457 KB

If you have a license for LiveLink™ for SolidWorks®, download also the additional update for this product

Bullet Windows comsol_4.3.1.161_llsw_win.exe 609 KB


Before you proceed with the installation, make sure to exit any running COMSOL process.


Run the downloaded .exe-file to extract the update to the COMSOL 4.3a installation directory, for example C:\Program Files\COMSOL\COMSOL43a. You can install the updates for the different products in any order.


Copy the downloaded .zip-file to the COMSOL 4.3a installation directory:

cp [installdir]/comsol43a

where [installdir] is the root of the installation, for example /usr/local. Unzip it by the commands:

cd [installdir]/comsol43a
unzip -o

If you have not disabled SELinux, run the following command:

chcon -t textrel_shlib_t [installdir]/comsol43a/lib/[platform]/lib*

where platform is glnx86 or glnxa64.


Double-click the downloaded .dmg file to mount the disk image. In the Finder, open the mounted disk and double-click the COMSOL installer icon. Select your COMSOL installation folder, usually called COMSOL43a.

Check your installation

  1. Start COMSOL Multiphysics.
  2. On the Help menu, click About COMSOL Multiphysics.
  3. Check that the version number is (If not, the installation did not succeed).

Update Details for Update 1

COMSOL Multiphysics

  • Improved handling of load cases for parametric sweeps.
  • Corrected and improved handling of selections in the Report Generator.
  • Grid ticks are now displayed correctly.
  • Corrected problem that could occur when moving a solver node.
  • Improved cluster performance and stability.
  • The documentation root directory is now correctly updated.
  • User-defined material libraries are now saved correctly in all cases.
  • Corrected handling of empty values when using <sub> and <sup> HTML tags in titles and axis labels.
  • Generating reports in Word format now works correctly on Mac and Linux.
  • The Results window has been renamed to the Table window and dynamically displays the name of the current table.
  • In the Analytic, Interpolation, and Piecewise functions' settings window, the Parameters section has been renamed to the Definition section.
  • Periodic PDE constraints for vector elements now work in all space dimensions.
  • It is now possible to remove all study nodes.
  • uohm is now a valid syntax for microohm.
  • Improved stability and user interface.

AC/DC Module

  • Using the Transition boundary condition in the Magnetic Fields interface now works correctly when solving for the background field.
  • Using power excitation in a Single-Turn Coil Domain now works correctly.
  • Units are now displayed consistently in the Multi-Turn Coil Domain settings.

CFD Module

  • Corrected the conservative form for the level set formulation in 2D-axisymmetry.
  • The Laminar Inflow boundary condition no longer constrains the velocity to zero on the symmetry axis when solving for 2D-axisymmetry.

Chemical Reaction Engineering Module

  • Corrected Turbulent Mixing in the Concentrated Species interface.
  • The Periodic and Pair Conditions in the Concentrated Species interface now work correctly when using the Maxwell-Stefan diffusion model.
  • Improved backward compatibility for the Reacting Flow interface when opening models created with a COMSOL version earlier than 4.3.
  • Improved stability in the Reacting Flow and the Reaction Engineering interfaces.
  • To add a CAPE-OPEN Interface node, right-click Global Definitions and select Functions>CAPE-OPEN Interface.

Heat Transfer Module

  • The physics-induced mesh in the Non-Isothermal Flow interface now also accounts for interior walls.
  • Improved convergence when using the Inflow Heat Flux boundary condition.
  • Improved load group factor implementation for stabilization.
  • Corrected total heat flux/source expression in 2D-axi geometries with moving frames.
  • Renamed vapor mass fraction to omega_moist in order to avoid variable conflict with angular frequency (omega).
  • The Viscous Heating feature now supports Swirl flow in 1D- and 2D-axisymmetry.
  • Improved backward compatibility for models using a Line Heat Source.
  • Thin conductive shell interface now works correctly for solving a time dependent study on a moving frame.
  • Improved backward compatibility for models using crosswind diffusion.

MEMS Module

  • Adding an Electric Shielding feature to a Piezoresistivity interface now works correctly.
  • The Linear Buckling study step is now available in the MEMS Module.

Microfluidics Module

  • Improved default solver suggestions when using the Free Molecular Flow interface.

RF Module

  • Corrected handling of Periodic Conditions.
  • The scattering boundary condition now works correctly also when the Electric displacement field model uses Polarization.
  • Corrected expressions for PMLs used with 2.5D and with mode analysis.
  • Microwave heating boundary mode analysis now supports eigenvalue transforms.
  • Corrected electromagnetic loss expressions for eigenfrequency studies to be non-negative.
  • Surface current density norm is now available in the postprocessing variables list.

Structural Mechanics Module

  • Principal stresses evaluated at Gauss points now contain a unit.
  • Corrected bending thermal strains in curved thick shells.
  • Corrected cyclic symmetry in 2D with a common point for the sector boundaries.

LiveLink™ for Excel®

  • LiveLink™ for Excel® now supports Excel 2007.
  • Corrected background color when using software rendering.
  • Entering numbers with a regional decimal separator is now supported.
  • Improved postprocessing for 0D models.
  • LiveLink™ for Excel® now works on 64-bit Japanese Windows.
  • Corrected saving and loading to Excel files for layers in ECAD import and for parameter estimation.
  • Improved stability and user interface.

COMSOL LiveLink™ for MATLAB®

  • Models using external functions are now portable between supported operating systems.

COMSOL LiveLink™ for Inventor®

  • Fixed “Failed to connect to Inventor. Please make sure Inventor is running” error that could occur when synchronizing.

COMSOL LiveLink™ for Solid Edge®

  • Values for linked dimensional parameters are now displayed correctly.