Generation of polygonal gas interfaces by soap film for Richtmyer–Meshkov instability study

Wang, Minghu; Si, Ting; Luo, Xisheng

doi:10.1007/s00348-012-1427-9

Cited by 52 publications

(24 citation statements)

References 29 publications

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“…However, a soap film is seldom used to form a density interface other than the spherical or cylindrical bubble mainly due to the difficulty in controlling its shape. Recently a new method to form polygonal soap film interfaces has been developed by using thin pins around polygonal vertexes (Wang, Si & Luo 2013).…”

mentioning

confidence: 99%

The Richtmyer–Meshkov instability of a three-dimensional interface with a minimum-surface feature

Luo

Wang

2013

J. Fluid Mech.

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A novel method to create a discontinuous gaseous interface with a minimumsurface feature by the soap film technique is developed for three-dimensional (3D) Richtmyer-Meshkov instability (RMI) studies. The interface formed is free of supporting mesh and the initial condition can be well controlled. Five air/SF 6 interfaces with different amplitude are realized in shock-tube experiments. Timeresolved schlieren and planar Mie-scattering photography are employed to capture the motion of the shocked interface. It is found that the instability at the linear stage in the symmetry plane grows much slower than the predictions of previous two-dimensional (2D) impulsive models, which is ascribed to the opposite principal curvatures of the minimum surface. The 2D impulsive model is extended to describe the general 3D RMI. A quantitative analysis reveals a good agreement between experiments and the extended linear model for all the configurations including both the 2D and 3D RMIs at their early stages. An empirical model that combines the early linear growth with the late-time nonlinear growth is also proposed for the whole evolution process of the present configuration.

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mentioning

confidence: 99%

The Richtmyer–Meshkov instability of a three-dimensional interface with a minimum-surface feature

Luo

Wang

2013

J. Fluid Mech.

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“…The time-evolving features in experiment were acquired by means of laser sheet illumination of the seeded SF 6 gas, and the quantitative geometric scales were compared with the counterparts from numerical simulation, and good agreement was reached. Recent work by Wang et al 95 used the thin pins to restrict the soap film interface to form various polygonal interfaces, such as square, triangular, diamond volumes. Specifically, thin pins were used as angular vertexes to connect the adjacent sides of polygonal soap films to remove the pressure singularities around the vertexes caused by the surface tension.…”

Section: Cylindrical Gaseous Interfacementioning

confidence: 99%

“…They claimed that the presence of thin pins only has limited effects on the interface evolution and can even be ignored at the very early stage after a careful examination. As a verified work, Wang et al 95 experimentally and numerically compared the evolution of three heavy polygons (SF 6 polygon surrounded by air) including a square, a triangle and a diamond after a planar shock impact. Both the wave pattern and interface morphology coincided well with each other, verifying the method proposed.…”

Section: Cylindrical Gaseous Interfacementioning

confidence: 99%

Review of experimental Richtmyer–Meshkov instability in shock tube: From simple to complex

Zhai

Zou

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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Richtmyer–Meshkov (RM) instability is regarded as a central role for understanding the hydrodynamic processes involved in inertial confinement fusion, supersonic combustion and supernova explosion. Because of its academic implication and engineering applications, the RM instability has received much attention since it was proposed. As an important tool for studying RM instability, shock tube experiment on shock–fluid interface interaction has been widely adopted and great progress has been achieved in past decades. The generation of a shock wave, the formation of an initial interface and the diagnostic of flow field are the three elements for studying the RM instability experimentally. This review surveys the advances in experimental investigations of RM instability in shock tube environment. Originating from a simple configuration as a planar shock interacting with a simple perturbed interface, the experimental study of RM instability approaches more complex situations like a convergent shock with a simple interface, or a planar shock with a complex interface. It is then expected that the experimental study on the real circumstance may be realized by using a complex shock with a complex interface. Finally, we propose the following issues for future study: (1) evolution of the RM instability induced by cylindrically converging shock waves; (2) effect of the three dimensions on the RM instability; (3) interaction of perturbed shock wave with an initially uniform or perturbed interface; and (4) formation and mixing mechanism of the compressible turbulence in the final stage of the RM instability.

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“…In these methods, the influences of membrane and support would be avoided, but gaseous diffusion often happens initially between two fluids and the exact initial conditions have to be determined afterward. From the above-mentioned methods, different shapes of gaseous interface can be obtained, including single and multi-mode interfaces (Mariani et al, 2008;Long et al, 2009;Balasubramanian et al, 2012), spherical bubbles (Ranjan et al, 2011), circular cylinders (Hass & Sturtevant, 1987Hosseini & Takayama, 2005a;Tomkins et al, 2008), elliptical cylinders (Zou et al, 2010), and polygonal blocks (Bates & Nikiforakisb, 2007;Wang et al, 2013). As to the diagnostics, various methods such as shadowgraphy (Hass & Sturtevant, 1987;Layes et al, 2009), schlieren (Zhai et al, 2011), doubleexposure holographic interferometry (Hosseini & Takayama, 2005a), and laser sheet imaging (Brouillette, 2002;Ranjan et al, 2011;Orlicz et al, 2013) have been used.…”

Section: Introductionmentioning

confidence: 98%

“…Interfaces used in previous experiments can mainly be classified into two types, i.e., with and without membranes. Interfaces with membrane consist of soap film interface (Haas & Sturtevant, 1987;Ranjan et al, 2005;Layes et al, 2009;Zhai et al, 2011;Si et al, 2012;Wang et al, 2013;Luo et al, 2013) and microfilm interface (Bates & Nikiforakisb, 2007;Mariani et al, 2008). In these methods, the shape of interface with sharp boundaries can accurately be determined.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of Richtmyer-Meshkov instability in a cylindrical converging shock tube

Zhai

Luo

2014

Laser Part. Beams

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The interaction of a cylindrical converging shock wave with an initially perturbed gaseous interface is studied experimentally. The cylindrical converging shock is generated in an ordinary shock tube but with a specially designed test section, in which the incident planar shock wave is directly converted into a cylindrical one. Two kinds of typical initial interfaces involving gas bubble and gas cylinder are employed. A high-speed video camera combined with schlieren or planar Mie scattering photography is utilized to capture the evolution process of flow structures. The distribution of baroclinic vorticity on the interface induced by the cylindrical shock and the reflected shock from the center of convergence results in distinct phenomena. In the gas bubble case, the shock focusing and the jet formation are observed and the turbulent mixing of two fluids is promoted because of the gradually changed shock strength and complex shock structures in the converging part. In the gas cylinder case, a counter-rotating vortex pair is formed after the impact of the converging shock and its rotating direction may be changed when interacting with the reflected shock for a relatively long reflection distance. The variations of the interface displacements and structural dimensions with time are further measured. It is found that these quantities are different from those in the planar counterpart because of the shock curvature, the Mach number effect and the complex shock reflection within the converging shock tube test section. Therefore, the experiments reported here exhibit the great potential of this experimental method in study of the Richtmyer-Meshkov instability induced by converging shock waves.

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Generation of polygonal gas interfaces by soap film for Richtmyer–Meshkov instability study

Cited by 52 publications

References 29 publications

The Richtmyer–Meshkov instability of a three-dimensional interface with a minimum-surface feature

The Richtmyer–Meshkov instability of a three-dimensional interface with a minimum-surface feature

Review of experimental Richtmyer–Meshkov instability in shock tube: From simple to complex

Experimental study of Richtmyer-Meshkov instability in a cylindrical converging shock tube

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