摘要
Interface width effect on the spherical Rayleigh–Taylor instability in the weakly nonlinear regime is studied by numerical simulations.For Legendre perturbation mode Pn with wave number Kn and interface half-width L,the commonly adopted empirical linear growth rate formulaγnem(L)=γn/√1+KnL is found to be sufficient in spherical geometry.At the weakly nonlinear stage,the interface width affects the mode coupling processes.The development of the mode P2n is substantially influenced by the interface width.Moreover,the nonlinear saturation amplitude increases with the interface width.
作者
杨云鹏
张靖
李志远
王立锋
吴俊峰
叶文华
贺贤土
Yun-Peng Yang;Jing Zhang;Zhi-Yuan Li;Li-Feng Wang;Jun-Feng Wu;Wun-Hua Ye;Xian-Tu He(School of Physics,Peking University,Beijing 100871,China;Center for Applied Physics and Technology,HEDPS,and College of Engineering,Peking University,Beijing 100871,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)
基金
Supported by the National Natural Science Foundation of China(Grant Nos.11575033,11675026,and 11975053)。