摘要
数值模拟是研究大气湍流的主流研究法,目前主要有:直接数值模拟法、雷诺平均模拟法、大涡数值模拟法.通过对比分析发现,直接数值模拟法只限于较小雷诺数的大气湍流,可探索一些大气湍流的物理机理.雷诺平均模拟法通过N-S方程进行系综平均,可得大气湍流平均量方程;大涡数值模拟法通过对N-S方程进行低通滤波,可得大气湍流大尺度运动方程.因此,后两种方法计算量远小于第一种,以现阶段计算能力均可实现,适用于大气湍流领域研究.
Numerical simulation is the main research method of atmospheric turbulence.At present,it mainly includes Direct Numerical Simulation(DNS),Reynolds Average Navier-Stokes(RANS)and Large Eddy Simulation(LES).Through comparative analysis,it is found that DNS is only limited to atmospheric turbulence with smaller Re number,and some physical mechanisms of atmospheric turbulence can be explored.RANS can obtain the atmospheric turbulence average equation by ensemble average of N-S equation;LES can obtain the atmospheric turbulence large-scale motion equation by low-pass filtering of N-S equation.Therefore,the calculation amount of the latter two methods is far less than that of the first one,which can be realized at the present stage and is suitable for the research of atmospheric turbulence.
作者
王磊
种曌天
谭清美
Wang Lei;Zhong Zhaotian;Tan Qingmei(School of Management Engineering,Nanjing University of Information Technology,Nanjing,Jiangsu 210044,China;School of Finance,Nanjing University of Finance and economics,Nanjing,Jiangsu 210023,China;School of Economics and Management,Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu 211106,China)
出处
《伊犁师范学院学报（自然科学版）》
2020年第3期49-55,共7页
Journal of Yili Normal University：Natural Science Edition
基金
国家社会科学基金重点项目(19AGL003)
南京信息工程大学人才启动经费资助项目(2019r096).
关键词
大气湍流
数值模拟
对比分析
atmospheric turbulence
numerical simulation
comparative analysis
