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 Select Interface Width Effect on the Weakly Nonlinear Rayleigh–Taylor Instability in Spherical Geometry Yun-Peng Yang, Jing Zhang, Zhi-Yuan Li, Li-Feng Wang, Jun-Feng Wu, Wun-Hua Ye, and Xian-Tu He Chin. Phys. Lett.    2020, 37 (7): 075201 .   DOI: 10.1088/0256-307X/37/7/075201 Abstract   HTML   PDF (1243KB) Interface width effect on the spherical Rayleigh–Taylor instability in the weakly nonlinear regime is studied by numerical simulations. For Legendre perturbation mode $P_n$ with wave number $k_n$ and interface half-width $L$, the commonly adopted empirical linear growth rate formula $\gamma_n^{\rm em}(L)=\gamma_n/\sqrt{1+k_nL}$ 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 $P_{2n}$ is substantially influenced by the interface width. Moreover, the nonlinear saturation amplitude increases with the interface width.