An Improved EASM for Numerical Simulation of 3D Thermal Stratified Wake Flow
Generally, three-dimensional thermal stratified wake flow would induce strong pressure gradients and buoyancy effects, which results in asymmetry distribution of water density, pressure and temperature. This brings many difficulties in free numerical simulation of such complex thermal turbulent. However, most explicit algebraic stress models are formulated for turbulent shear flows without accounting for buoyant force, which may fail to give satisfactory results for current thermal turbulent flow. In this paper, an improved explicit algebraic stress model (EASM) was developed according to the corresponding implicit formulations of the Reynolds stress and scalar flux. The tensor representation of the Reynolds stresses are divided into two parts, the former is composed of EASM derived by Wallin & Johansson (2000) and latter is the formulations of buoyant stress. In the derivation of explicit algebraic active scalar flux model, WWJ (Wikstr(0)m, WaUin and Johansson, 2000) model only for explicit tensor representation of passive scalar flux is improved by affiliating external buoyancy effects terms. The current EASM is discretized on three dimensional unstructured grids and compared with experimental data of thermal stratified wake flow. The calculations show that the model yields better results than the k-∈model.
EASM Thermal Stratified Wake Flow Unstructured grids
Xing Ling-hang Jin Feng Huang Guo-bing
Changjiang River Scientific Research Institute, 430010, No. 23 Huangpu Road, Wuhan, China
国际会议
南京
英文
240-244
2010-05-08（万方平台首次上网日期，不代表论文的发表时间）