New Functionality

  • A new Conjugate Heat Transfer multiphysics interface (fluid flow, fluid heat transfer, and solid heat transfer) for modeling electronic cooling and heat sinks, for example.
  • A new physics interface for Heat Transfer in Porous Media accounts for the effect of a tortuous path, which results in the additional convective thermal dispersion perpendicular to the main flow. The temperature field is thus more accurately described compared to previous implementations.
  • A new physics interface for Radiation in Participating Media introduces the effect of absorption of energy in a media subjected to radiation. The radiation pattern from one surface to another then depends on the media present between the radiating or reflecting surfaces.
  • The new physics interface for Low-Reynolds Number k-ε Turbulence Model yields a higher accuracy in the description of the flow and heat transfer close to walls.
  • The new Open Boundary condition is useful for modeling an open boundary where heat can flow out from the domain or into the domain with a specified exterior temperature.
  • Improved stabilization yields increased robustness and higher accuracy for a given computational cost compared to previous versions.

Backward Compatibility

All backward compatibility issues are planned to be solved for version 4.0a unless explicitly stated.

Turbulent Flow with Wall Functions and Heat Transfer
in Conjugate Heat Transfer

Highly conductive layers in the interface between a solid and a fluid are not yet fully implemented and give incorrect results when used in combination with wall functions in turbulent flow. This is caused by the incorrect definition of the wall temperature as the average of the solid and fluid temperature in these physics interfaces.

In some case, you can correct this in equation view. Please contact technical support if you run into problems with such a model.

Turbulent Flow with Wall Functions and Surface-to-Surface Radiation

The wall temperature is incorrectly defined as the average of the fluid temperature and the solid temperature in version 4.0. This gives incorrect results when using wall functions in combination with surface-to-surface radiation.

In some case, you can correct this in equation view. Please contact technical support if you run into problems with such a model.

K-ω Turbulance Model

The k-ω turbulence model physics interface is not yet implemented in version 4.0. It is planned for the CFD Module in version 4.1.

The Low-Reynolds k-ε turbulence model interface is an excellent alternative for higher accuracy in models including confined flows.