煤量烧圆家重点实验宝 §2 TurbulentⅤ scouse Coefficient Models 1. Concept of turbulent viscousity For two-dimensional boundary layer Boussinesq( 1877) proposed au t=-p=1 t -Reynolds stress u- fluid velocity in main stream ut- turbulent viscosity coefficient Wuhan 430074 P.R. CHINA E-mail:pcbnlcc@hust.edu.cnNL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn §2 Turbulent Viscouse Coefficient Models 1. Concept of turbulent viscousity For two-dimensional boundary layer, Boussinnesq(1877) proposed y u u v t t    = − ' ' =  (2-8) t - Reynolds stress u - fluid velocity in main stream t - turbulent viscosity coefficient