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12.19.2 Including Turbulence Generation Due to Buoyancy

If you specify a non-zero gravity force (in the Operating Conditions panel), and you are modeling a non-isothermal flow, the generation of turbulent kinetic energy due to buoyancy ( $G_b$ in Equation  12.4-1) is, by default, always included in the $k$ equation. However, FLUENT does not, by default, include the buoyancy effects on $\epsilon$.

To include the buoyancy effects on $\epsilon$, you must turn on the Full Buoyancy Effects option under Options in the Viscous Model panel.

This option is available for the three $k$- $\epsilon$ models and for the RSM.


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