New Functionality in Version 4.3a

  • A new Reacting Flow user interface: a multiphysics interface for mass transport in fluids. The Reacting Flow user interface combines the physics from Single Phase Flow and Transport of Concentrated Species and includes a unique reaction feature and pseudo time stepping for both the species and the momentum equations.
  • Many input fields in the Reaction and Species nodes in the Reaction Engineering interface have been equipped with an Automatic/User Defined option. The User Defined option for these fields is in addition equipped with an Reset to Default button in order to generate the automatic expression, which can then be manually edited.

Backward Compatibility vs. 4.3

Brinkman Equations and Free and Porous Media Flow

The momentum equations in the Brinkman Equations interface and the Free and Porous Media Flow interface have been corrected. The term -Qbr·u/εp2 in the right hand side previously lacked the factor 1/εp2 , where εp is the porosity.

Reacting Flow Interface Name Change

The Reacting Flow interfaces have been renamed Reacting Flow in Porous Media. Opening a model using either the Reacting Flow, Diluted Species or the Reacting Flow, Concentrated Species interface, the interface is renamed Reacting Flow in Porous Media.

Weak Constraints Update for Fluid Flow Interfaces

The weak constraint formulation for some boundary conditions in the following interfaces have been updated:

  • Laminar Flow
  • Brinkman Equations
  • Free and Porous Media Flow

See CFD Module for details.


In physics user interfaces modeling migration (Transport of Diluted Species, Transport of Concentrated Species, Reacting Flow in Porous Media, Diluted Species, Reacting Flow in Porous Media, Concentrated Species, Tertiary Current Distribution, and Nernst-Planck) anisotropic mobility is now supported, and the mobility can be set to following the Nernst-Einstein relation. The default setting when making new models has been changed to use the Nernst-Einstein relation. Model Java-files generated prior to 4.3a using Migration will have to be modified manually to account for these changes.