A turbulence model for buoyant flows based on vorticity generation.

Domino, Stefan Paul ; Nicolette, Vernon F. ; O' ; Hern, Timothy John ; Tieszen, Sheldon R. ; Black, Amalia Rebecca

Sandia National Laboratories

关键词: Turbulent Flow;    Kinetic Equations;    Air;    Turbulence-Mathematical Models.;    Kinetic Theory Of Liquids-Mathematical Models.;   

DOI  :  10.2172/875637
RP-ID  :  SAND2005-6273
RP-ID  :  AC04-94AL85000
RP-ID  :  875637

美国|英语

来源: UNT Digital Library

【 摘 要 】

A turbulence model for buoyant flows has been developed in the context of a k-{var_epsilon} turbulence modeling approach. A production term is added to the turbulent kinetic energy equation based on dimensional reasoning using an appropriate time scale for buoyancy-induced turbulence taken from the vorticity conservation equation. The resulting turbulence model is calibrated against far field helium-air spread rate data, and validated with near source, strongly buoyant helium plume data sets. This model is more numerically stable and gives better predictions over a much broader range of mesh densities than the standard k-{var_epsilon} model for these strongly buoyant flows.