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- Title
Convergent Richtmyer-Meshkov instability on two-dimensional dual-mode interfaces.
- Authors
Jinru Xu; He Wang; Zhigang Zhai; Xisheng Luo
- Abstract
We report the first shock-tube experiments on two-dimensional dual-mode air-SF6 interfaces with different initial spectra subjected to a convergent shock wave. The convergent shock tube is specially designed with a tail opening to highlight the Bell-Plesset (BP) and mode-coupling effects on amplitude development of fundamental mode (FM). The results show that the BP effect promotes the occurrence of mode coupling, and the feedback of high-order modes to the FMalso arises earlier in convergent geometry than that in its planar counterpart. Relatively, the amplitude growth of the FM with a higher mode number is inhibited by the feedback, and saturates earlier. The FM with a lower mode number is affected more heavily by the BP effect, and finally dominates the flow. A new model is proposed to well predict the amplitude growths of the FM and high-order modes in convergent geometry. In particular, for FM that reaches its saturation amplitude, the post-saturation relation is introduced in the model to achieve a better prediction.
- Subjects
RICHTMYER-Meshkov instability; SHOCK tubes; SHOCK waves; FISH meal
- Publication
Journal of Fluid Mechanics, 2023, Vol 965, p1
- ISSN
0022-1120
- Publication type
Article
- DOI
10.1017/jfm.2023.395