COMSOL 4.3b Update 1

Released June 27, 2013.

For update details, click this link:
Update Details.

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 4.3b 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 4.3b before you proceed.

Download Update

Bullet Windows comsol_4.3.2.189_win.exe 60.1 MB
Bullet Linux 85.1 MB
Bullet Mac OS X comsol_4.3.2.189_mac.dmg 59.5 MB

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

Bullet Windows comsol_4.3.2.189_mli_win.exe 482 KB
Bullet Linux 25 KB
Bullet Mac OS X comsol_4.3.2.189_mli_mac.dmg 59 KB

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

Bullet Windows comsol_4.3.2.189_llinv_win.exe 964 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 4.3b installation directory, for example C:\Program Files\COMSOL\COMSOL43b. You can install the updates for the different products in any order.


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

cp [installdir]/comsol43b

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

cd [installdir]/comsol43b
unzip -o

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

chcon -t textrel_shlib_t [installdir]/comsol43b/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 COMSOL43b.

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

  • Geometry objects that you add to a Work Plane's Plane Geometry no longer hide any projected or intersected wireframe.
  • The mesh generation no longer creates an unnecessarily fine mesh for some 3D geometries.
  • Creating a swept mesh for a domain with isolated linking faces now works.
  • The Circular edge plane type for work planes now works correctly also when you run in a client-server mode.
  • PMLs now work together with geometries that include virtual geometry operations.
  • Fixed a problem with units in inputs for a few user-defined functions.
  • Results while solving now works correctly for models with multiple studies.
  • Performance improvements for the SOR line, Vanka, and SCGS solvers.
  • Improved handling of probes.
  • Multiple plots in the same plot group now appear correctly using DirectX rendering.
  • Fixed graphics problem for Mac OS X 10.7 and 10.8.
  • Fixed problem that occurred when exiting the program on Linux.
  • Minor improvements for the sensitivity and optimization functionality.
  • Improved stability and user interface.

AC/DC Module

  • In the Magnetic Field Formulation physics, selecting Linearized resistivity and then changing the Conduction current relation in Faraday's Law now works correctly.
  • Fixed equation display for the subnodes of the 3D Single-Turn Coil.
  • Gauge Fixing for A-Field now handles Magnetic Potential and External Magnetic Vector Potential boundary conditions correctly.
  • Units can now be used in the specification of the primitive vectors in the RLC Coil Group feature.
  • Voltage-driven Multi-Turn Coil now correctly takes Harmonic perturbation into account.

Batteries & Fuel Cells Module

  • You can now use model inputs for Porous Electrode nodes in the Secondary Current Distribution (siec) user interface.

CFD Module

  • The Mass Flow boundary condition now works with curved boundaries.
  • Improved default solver settings for Reacting Flow user interface.

Chemical Reaction Engineering Module

  • Changing the reaction type in a model now works as expected.
  • Improved default solver settings for Reacting Flow user interface.
  • The Species Transport in Porous Media user interface now takes time derivatives of the fluid volume into account.

Electrochemistry Module

  • The Heat Transfer in Porous Media and Thermal Dispersion features are available in the Electrochemistry Module.

Fatigue Module

  • The fatigue usage factor in stress-based models is now set to zero for states with high compressive stresses.

Heat Transfer Module

  • Removed duplicated postprocessing variables sections.
  • Fixed definition of the enthalpy variable. It now supports pressure-dependent material properties.

Microfluidics Module

  • The Mass Flow boundary condition now works with curved boundaries.

Molecular Flow Module

  • Specifying a very high pump speed in the Vacuum pump boundary condition no longer result in negative pressures.

Particle Tracing Module

  • The Diffuse scattering option in the Wall boundary condition now gives the correct angular distribution for the particles.
  • The Diffuse scattering option now works correctly when selected as the Otherwise option when using conditional boundary conditions.
  • The Collision frequency is now set correctly in the Elastic Collision Force feature when setting it directly and using the Monte Carlo collision model.
  • The correct force density is now computed in the Fluid-Particle interaction feature.

Plasma Module

  • The Microwave Plasma interface now works correctly when used in conjunction with an Electromagnetic Waves interface.
  • The Mass Flow boundary condition now works with curved boundaries.

Semiconductor Module

  • Setting the Carrier statistics property to Fermi-Dirac and the Solution property to Majority carriers only now works correctly.
  • The Thin Insulator Gate boundary condition now gives the correct results when the Formulation is set to Finite element.
  • The quasi-Fermi energy levels now have the correct dependence on the degeneracy factors.
  • The generation and recombination features now work correctly when the Solution is set to Majority carriers only.

Structural Mechanics Module

  • Coupled Shell-Solid models with shared names of displacement variables now work correctly.
  • Fixed error in Spring Foundation and Added Mass for 2D axial symmetry.
  • Avoids error conditions that could appear when mixing a Linear Elastic material with a Linear Viscoelastic material in 2D Plane Stress and when adding a Linear Elastic material after a Linear Viscoelastic material.
  • Corrected an error when Prescribed Velocity or Prescribed Acceleration was used in a fluid-structure interaction analysis.

Wave Optics Module

  • Removed coupling between counter-propagating waves at curved boundaries.

LiveLink™ for MATLAB®

  • The mphviewselection function now supports all geometry selection types.
  • Fixed mphmatrix to support evaluation of system matrices for eigenvalue studies.
  • Fixed error in the computation of complex integrals by the functions mphint2, mphevalpoint, mphmax, mphmean, and mphmin.
  • Fixed display of principle stress/strain plots in mphplot.
  • Fixed plotting of arrow plots with the function mphplot.

LiveLink™ for Inventor®

  • Fixed a problem that could cause a switch of assembly components during synchronization.
  • Fixed several issues with results plots in One Window for Inventor.