Buoyancy Turbulence is an option in CFX-Pre that is available for some turbulence models when buoyancy is being modeled. When the option is set to Production, a buoyancy production term is included in the equation for . When the option is set to Production and Dissipation, a buoyancy production term is included in the equations for (as applicable). See Buoyancy Turbulence and the accompanying text, which describe the treatment for the and models.