LARGE EDDY SIMULATION OF VERTICAL JET IMPINGEMENT WITH A FREE SURFACE

作     者：CHEN Yong-ping LI Chi-wai ZHANG Chang-kuang 

作者机构：Departmentof Civil and Structural Engineering The Hongkong Polytechnic University Hongkong China College of Traffic and Ocean Engineering Hohai University Nanjing 210098 China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2006年第18卷第2期

页      面：148-155页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project supported by a grant from the Research Grant Council of the Hong Kong Special Administrative Region (Grant No: 5048/01E) 

主　　题：Large Eddy Simulation (LES) 2D slot jet free surface 

摘      要：The flow characteristics of a 2D slot jet vertically impinging on free surfaces are numerically investigated by the Large Eddy Simulation （LES） with a dynamic Sub-Grid Scale （SGS） model. The σ-coordinate transformation is introduced to map the depth-variable physical domain to a depth-uniform computational domain. The split-operator scheme, which splits the solution procedure into advection, diffusion and pressure propagation steps, is employed to solve the instantaneous velocity and pressure field. A fully nonlinear Lagrange-Euler method is used to compute the free surface elevation. The numerical results show that the jet retains good self-similarity in the Zone of Eestablished Flow （ZEF）, while the turbulence of jet shifts gradually from isotropic to anisotropic in the Zone of Surface Impingement （ZSI）. When the jet approaches the free surface, the centerline velocity decreases rapidly and the flow is deflected by the free surface. Two symmetrical surface jets are formed in the Zone of Horizontal Jets （ZHJ）. An approximate Guassian distribution of super-elevation is also formed on the free surface. The computed results are in good agreement with the available experimental data.