New Functionality in Version 4.3a

New Models

  • A new model (split _recombine_mixer) computes the flow in a 3 dimensional mixer in the absence of physical diffusion. The results are compared with a benchmark paper from the literature.
  • A new model (rotating_channel) computes fluid convection in a channel embedded within a spinning disk. The results are compared with a benchmark paper from the literature.

Changes to the Molecular Flow and Transitional Flow Interfaces

Updates to the Free Molecular Flow and Transitional flow have produced minor changes in functionality that are not currently documented. The following changes have been made. In the Free Molecular Flow interface, integration groups are no longer supported. The dependent variables for Transitional flow are no longer displayed in the discretization section and can no longer be renamed.

Phase Field Interface: Transient with Initialization Study

The 3D Phase Field user interface now includes a preset Transient with Initialization study in addition to the Time Dependent study.

Weak Constraints Update for Fluid Flow Interfaces

The weak constraints formulation for the following boundary conditions in the following interfaces has been updated:

  • Laminar Flow
  • Creeping Flow
  • Two-Phase Flow, Level Set
  • Two-Phase Flow, Phase Field
  • Two-Phase Flow, Moving Mesh
  • Symmetry
  • The Slip option in the Wall feature
  • Brinkman Equations
  • Free and Porous Media Flow
  • Slip Flow
  • Symmetry
  • The Slip option in the Wall feature

See the CFD Module Release Notes for details.

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.

Mobility

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.