Interface coupling effects of weakly nonlinear Rayleigh-Taylor instability with double interfaces

doi:10.1088/1674-1056/ab6965

Abstract Taking the Rayleigh-Taylor instability with double interfaces as the research object, the interface coupling effects in the weakly nonlinear regime are studied numerically. The variation of Atwood numbers on the two interfaces and the variation of the thickness between them are taken into consideration. It is shown that, when the Atwood number on the lower interface is small, the amplitude of perturbation growth on the lower interface is positively related with the Atwood number on the upper interface. However, it is negatively related when the Atwood number on the lower interface is large. The above phenomenon is quantitatively studied using an analytical formula and the underlying physical mechanism is presented.

Keywords: Rayleigh-Taylor instability weakly nonlinear regime numerical simulation

Received: 11 November 2019
Revised: 06 January 2020
Accepted manuscript online:

PACS:	47.20.Ma	(Interfacial instabilities (e.g., Rayleigh-Taylor))
	52.57.Fg	(Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor, Richtmyer-Meshkov, imprint, etc.))
	52.35.Mw	(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11575033, 11675026, and 11975053) and the Science Foundation from China Academy of Engineering Physics (Grant No. CX2019033).

Corresponding Authors: Wenhua Ye
E-mail: ye_wenhua@iapcm.ac.cn

Cite this article:

Zhiyuan Li(李志远), Lifeng Wang(王立锋), Junfeng Wu(吴俊峰), Wenhua Ye(叶文华) Interface coupling effects of weakly nonlinear Rayleigh-Taylor instability with double interfaces 2020 Chin. Phys. B 29 034704

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Interface coupling effects of weakly nonlinear Rayleigh-Taylor instability with double interfaces

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