Coupling between velocity and interface perturbations in cylindrical Rayleigh–Taylor instability  

作　　者：Hong-Yu Guo Li-Feng Wang Wen-Hua Ye Jun-Feng Wu Wei-Yan Zhang 郭宏宇;王立锋;叶文华;吴俊峰;张维岩(Graduate School,China Academy of Engineering Physics,Beijing 100088,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;HEDPS,Center for Applied Physics and Technology,Peking University,Beijing 100871,China)

机构地区：[1]Graduate School,China Academy of Engineering Physics,Beijing 100088,China [2]Institute of Applied Physics and Computational Mathematics,Beijing 100094,China [3]HEDPS,Center for Applied Physics and Technology,Peking University,Beijing 100871,China

出　　处：《Chinese Physics B》2018年第5期378-384,共7页中国物理B(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11275031,11475034,11575033,and 11274026);the National Basic Research Program of China(Grant No.2013CB834100)

摘　　要：Rayleigh–Taylor instability(RTI)in cylindrical geometry initiated by velocity and interface perturbations is investigated analytically through a third-order weakly nonlinear(WN)model.When the initial velocity perturbation is comparable to the interface perturbation,the coupling between them plays a significant role.The difference between the RTI growth initiated only by a velocity perturbation and that only by an interface perturbation in the WN stage is negligibly small.The effects of the mode number on the first three harmonics are discussed respectively.The low-mode number perturbation leads to large amplitudes of RTI growth.The Atwood number and initial perturbation dependencies of the nonlinear saturation amplitude of the fundamental mode are analyzed clearly.When the mode number of the perturbation is large enough,the WN results in planar geometry are recovered.

关 键 词：Rayleigh-Taylor instability weakly nonlinear cylindrical geometry 

分 类 号：TL61[核科学技术—核技术及应用]