中国物理B ›› 2025, Vol. 34 ›› Issue (11): 115202-115202.doi: 10.1088/1674-1056/ade06b

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Dependence of Rayleigh-Taylor instability of finite-thickness shell on initial perturbed wavelengths

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,§   

  1. 1 State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing 100083, China;
    2 Institute of Applied Physics and Computational Mathematics, Beijing 100094, China;
    3 Center for Applied Physics and Technology, HEDPS, and College of Engineering, Peking University, Beijing 100871, China
  • 收稿日期:2025-03-30 修回日期:2025-05-26 接受日期:2025-06-04 发布日期:2025-11-24
  • 通讯作者: Ben-Jin Guan, Ying-Jun Li E-mail:bjguanshandong@163.com;lyj@aphy.iphy.ac.cn
  • 基金资助:
    Project supported by the Fundamental Research Funds for the Central Universities (Grant No. 2022YQLX01), the Fund from the State Key Laboratory of Computational Physics (Grant No. 6142A05QN23009), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA 25051000).

Dependence of Rayleigh-Taylor instability of finite-thickness shell on initial perturbed wavelengths

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,§   

  1. 1 State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing 100083, China;
    2 Institute of Applied Physics and Computational Mathematics, Beijing 100094, China;
    3 Center for Applied Physics and Technology, HEDPS, and College of Engineering, Peking University, Beijing 100871, China
  • Received:2025-03-30 Revised:2025-05-26 Accepted:2025-06-04 Published:2025-11-24
  • Contact: Ben-Jin Guan, Ying-Jun Li E-mail:bjguanshandong@163.com;lyj@aphy.iphy.ac.cn
  • Supported by:
    Project supported by the Fundamental Research Funds for the Central Universities (Grant No. 2022YQLX01), the Fund from the State Key Laboratory of Computational Physics (Grant No. 6142A05QN23009), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA 25051000).

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.

关键词: Rayleigh-Taylor instability, mode-coupling, inertial confinement fusion

Abstract: 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.

Key words: Rayleigh-Taylor instability, mode-coupling, inertial confinement fusion

中图分类号:  (Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor, Richtmyer-Meshkov, imprint, etc.))

  • 52.57.Fg
47.20.Ma (Interfacial instabilities (e.g., Rayleigh-Taylor)) 52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))