Evolution of shock-accelerated heavy gas layer

On shock-induced heavy-fluid-layer evolution

“…Compared with the planar RMI, the additional geometric convergent effect (Bell 1951;Plesset 1954) and Rayleigh-Taylor stabilisation (RTS) effect induced by high pressures near the focusing point (Luo et al 2018), introduced by the cylindrical or spherical RMI, complicate the analysis on the fluid-layer evolution. Our previous work (Liang et al 2020a) extended the soap-film technique and investigated the RMI of five kinds of SF 6 gas layers in the planar geometry. Except for examining the conclusion of Budzinski et al (1994) that amplitudes of the two interfaces determine the flow patterns, Liang et al (2020a) discovered that the rarefaction waves (RW) reflected from the second interface induce the additional RTI of the first interface, which coincides with previous numerical studies (de Frahan, Movahed & Johnsen 2015).…”

“…Our previous work (Liang et al 2020a) extended the soap-film technique and investigated the RMI of five kinds of SF 6 gas layers in the planar geometry. Except for examining the conclusion of Budzinski et al (1994) that amplitudes of the two interfaces determine the flow patterns, Liang et al (2020a) discovered that the rarefaction waves (RW) reflected from the second interface induce the additional RTI of the first interface, which coincides with previous numerical studies (de Frahan, Movahed & Johnsen 2015).…”

Convergent Richtmyer–Meshkov instability of heavy gas layer with perturbed inner surface

“…In addition to the common flow regimes (i.e. baroclinic vorticity and pressure perturbation) presented in the RMI of an isolated interface, the two-interface case involves new physical mechanisms such as interface coupling (Mikaelian 1995) and the influence of complex waves reverberating between the two interfaces (Liang et al 2020), and thus presents much more complex instability evolution. Moreover, these new mechanisms could couple with geometric convergence and the RT effect, further complicating the instability development.…”

Impact of a shock wave on a heterogeneous foam film

“…The authors first show, using Henderson (1989), that the foam film accelerates after the impact during a time τ of the order of a few microseconds, and subsequently reaches a uniform velocity U, proportional to the shock amplitude (in the weak shock limit) and independent of the film thickness. The acceleration, normal to the gas/liquid interfaces, is responsible for a Richtmyer-Meshkov instability in the film (Taylor 1950;Richtmyer 1960;Rayleigh 1883;Brouillette 2002;Velikovich et al 2007;Liang et al 2020). The growth rates of the different modes have been predicted by Keller & Kolodner (1954) for this specific thin film geometry, in which the motions of both interfaces are coupled.…”

“…2007; Liang et al. 2020). The growth rates of the different modes have been predicted by Keller & Kolodner (1954) for this specific thin film geometry, in which the motions of both interfaces are coupled.…”