CFD Module

New Functionality in Version 4.2

New Physics Interfaces

• High Mach Number Flow interface for laminar and turbulent flow, handling flows with compressibility effects.

• Reacting Flow, Diluted Species multiphysics interface combining single-phase flow with mass transport of diluted species.

• Reacting Flow, Concentrated Species multiphysics interface combining single-phase flow with mass transport of concentrated species.

Single-Phase Flow

• Improved stabilization for the single-phase flow interfaces.

Multiphase Flow

• New Two-Phase Darcy’s Law interface for modeling of two-phase flow in porous media.

• New initialization for two-phase flow interfaces using a wall distance function.

• Improved stabilization for the Brinkman Equations and Free and Porous Media Flow interfaces.

Non-Isothermal Flow

• Thermal wall functions with turbulence now support the Surface-to-Surface Radiation, Reradiating Surface, and Highly Conductive Layer heat transfer boundary conditions.

• Vacuum pump boundary condition.

Porous Media Flow

• New multiphase flow in porous media interface that defines two sets of Darcy equations for the separate phases in porous media.

Fluid-Structure Interaction

• Improved solver settings for the Fluid-Structure Interaction interface.

Backward Compatibility vs. Version 3.5a

k-ω Turbulence Model

The k-ω turbulence model physics interface is not yet implemented in version 4.2. It is planned to be reintroduced in a future version of the CFD Module.

Version 4.2 includes automatic translation of models built with the previous k-ω turbulence model. When opened, the full model, including initial values and boundary conditions, is converted to the k-ε turbulence model. Once opened, the model can also be also be changed to the Low-Reynolds k-e Turbulence Model interface. The latter physics interface present an excellent alternative for higher accuracy in models including confined flows.