The Gravity global feature is automatically added when
Include gravity is selected at the interface level in the
Physical Model settings. It defines the gravity forces from the
Acceleration of gravity value. When a turbulence model that solves for the turbulent kinetic energy,
k, is used, the option
Include buoyancy-induced turbulence is available. When selected, the
Buoyancy contribution is by default set to
Automatic from multiphysics. Contributions are only obtained from multiphysics couplings that support buoyancy-induced turbulence, such as Nonisothermal Flow. If the
Buoyancy contribution is switched to
User defined, a text field for the
Turbulent Schmidt number appears. See also
Theory for Buoyancy-Induced Turbulence in the
CFD Module User’s Guide.
The Acceleration of gravity (SI unit m/s, default value
−gconstez in 2D axial symmetry and 3D and
−gconstey in 2D) is used to define the gravity forces. It should be a global quantity.