中国物理B ›› 2025, Vol. 34 ›› Issue (11): 115202-115202.doi: 10.1088/1674-1056/ade06b
Hong-Yu Guo(郭宏宇)1,†, Ben-Jin Guan(关本金)1,2,†,‡, Li-Feng Wang(王立锋)2,3, Zhi-Yuan Li(李志远)2, and Ying-Jun Li(李英骏)1,§
Hong-Yu Guo(郭宏宇)1,†, Ben-Jin Guan(关本金)1,2,†,‡, Li-Feng Wang(王立锋)2,3, Zhi-Yuan Li(李志远)2, and Ying-Jun Li(李英骏)1,§
摘要: Rayleigh–Taylor instability (RTI) of finite-thickness shell significantly impacts shell deformation and material mixing processes, with crucial implications for inertial confinement fusion (ICF). This study focuses on the RTI growth at the dual interfaces of a thin shell. A second-order weakly nonlinear (WN) analytical theory is developed to investigate the nonlinear deformation of the shell induced by different perturbation wavelengths initially imposed at the upper and lower interfaces. The validity of the theoretical results within the WN regime has been confirmed via two-dimensional Eulerian numerical simulations. Due to the interface coupling effect, the initially imposed single-mode perturbations at the upper and lower interfaces progressively evolve, exhibiting characteristics typical of multi-mode perturbations. When the initial perturbation wavelengths differ significantly, the primary structure of RTI retains its integrity, a behavior attributed to the dominance of long-wavelength perturbations. For comparable initial wavelengths, mode-coupling significantly distorts the bubble-spike structure in RTI, with the thin shell becoming prone to rupture due to enhanced nonlinear interactions.
中图分类号: (Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor, Richtmyer-Meshkov, imprint, etc.))