NEW EVALUATION OF THE K-ε TURBULENCE MODEL FORFREE BUOYANT PLUMES

Abstract

Several versions of the k- l turbulence model are examined as to their suitability for Computational fluid dynamics (CFD) modeling of free turbulent jets and buoyant plumes. The study is based largely on the availability of relatively new experimental data for turbulent buoyant plumes. The modeling includes the effect of buoyancy on the production of turbulence and examines several different models for this source term, including the standard gradient diffusion model, the generalized gradient diffusion model, and an algebraic model. The fluctuations in mixture fraction are also briefly examined.