摘要
用拟谱方法对随时间发展的二维混合层流场进行了直接数值模拟，给出了高雷诺数下在Ｋｅｌｖｉｎ－Ｈｅｌｍｈｏｌｔｚ波卷起后存在有限振幅次谐波时大尺度拟序结构进一步的失稳演变过程，包括大涡的配对、撕裂以及二次配对。同时探讨了初始的次谐波强度、雷诺数和相位差等对大涡配对和合并过程的影响。
Numerical simulations have been performed in time developing plane mixing layers at high Reynolds number with pseudo spectral method.The further evolution of the coherent structures originating from Kelvin Helmholtz rollup,such as pairing,shredding and second pairing in existence of subharmonic modes with finite amplitudes,were presented in this paper.The effects of initial amplitudes of pairing modes.Reynolds number and phase shift on pairing and merging of large eddies were investigated.
出处
《空气动力学学报》
CSCD
北大核心
1998年第4期439-446,共8页
Acta Aerodynamica Sinica
基金
国家自然科学基金
关键词
混合层
数值模拟
次谐波
失稳过程
流场
涡流
mixing layer
numerical simulation
psueudo spectral method
coherent structure
pairing instability
