A two-equation turbulence model and its application to a buoyant diffusionflame

A modified k-epsilon two-equation turbulence model was developed to improve the consideration of the important buoyancy effect on turbulence and turbu lent transport. which is a serious deficiency of the standard buoyancy-modi fied k-epsilon model. The present model was tested against both plane and a xisymmetric thermal plumes and a buoyant diffusion flame. The model was fou nd to be stable, computationally economic, promising and applicable to comp lex situations. The predicted plume spreading rates and velocity and temper ature profiles agreed well with experimental measurements. When compared wi th the standard buoyancy-modified k-epsilon turbulence model, this model gi ves significantly improved numerical results. (C) 1998 Published by Elsevie r Science Ltd. All rights reserved.