Numerical Simulation on Stratified Flow over an Isolated Mountain Ridge

作     者：李玲 Shigeo Kimura 

作者机构：State Key Laboratory of Hydroscience and EngineeringDepartment of Hydraulic EngineeringTsinghua University Institute of Nature and Environmental TechnologyKanazawa UniversityKanazawa 920-8667Japan 

出 版 物：《Tsinghua Science and Technology》 (清华大学学报（自然科学版（英文版）)

年 卷 期：2007年第12卷第3期

页      面：332-336页

核心收录：

学科分类：080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：the Scientific Foundation for Returned Overseas Chinese Scholars  Ministry of Education of China 

主　　题：internal gravity wave stratified flow complex topography numerical method 

摘      要：The characteristics of stratified flow over an isolated mountain ridge have been investigated numerically. The two-dimensional model equations, based on the time-dependent Reynolds averaged Navier- Stokes equations, are solved numerically using an implicit time integration in a fitted body grid arrangement to simulate stratified flow over an isolated ideally bell-shaped mountain. The simulation results are in good agreement with the existing corresponding analytical and approximate solutions. It is shown that for atmospheric conditions where non-hydrostatic effects become dominant, the model is able to reproduce typical flow features. The dispersion characteristics of gaseous pollutants in the stratified flow have also been studied. The dispersion patterns for two typical atmospheric conditions are compared. The results show that the presence of a gravity wave causes vertical stratification of the pollutant concentration and affects the diffusive characteristics of the pollutants.