Shock-bubble interactions: Features of divergent shock-refraction geometry observed in experiments and simulations

Ranjan, Desh; Niederhaus, John; Oakley, Jason; Anderson, Mark; Bonazza, Riccardo; Greenough, Jeffrey A.

doi:10.1063/1.2840198

Cited by 92 publications

(36 citation statements)

References 44 publications

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“…The 3D shock-bubble interactions problem is resolved properly. The similar flow features like vortex rings are also observed in the experimental and numerical results of [33,34].…”

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confidence: 81%

A high‐resolution method for compressible two‐fluid flows and simulation of three‐dimensional shock–bubble interactions

Zheng

Lee

2012

Numerical Methods in Fluids

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SUMMARYA high‐resolution method is developed to capture the material interfaces of compressible two‐fluid flows in multiple dimensions. A fluid mixture model system with single velocity and pressure is used, and viscous effect can also be taken into account. A consistent thermodynamic law based on the assumption of pressure equilibrium is employed to describe the thermodynamic behaviors of the pure fluids and mixture of two components. The splitting and unsplit Eulerian formulations of piecewise parabolic method are extended to numerically integrate the hyperbolic part of the model system, whereas the system of diffusion equations is solved using an explicit, central difference scheme. The block‐structured adaptive mesh refinement (AMR) capability is built in the hydrodynamic code to locally improve grid resolution. The resulting method is verified to be at least second‐order accurate in space. Numerical results show that the discontinuities, particularly contact discontinuities, can be resolved sharply. The use of AMR allows flow features at disparate scales to be resolved sufficiently. In addition, three‐dimensional shock–bubble interactions are simulated to investigate effects of Mach number on bubble evolution. The flow structures including those peculiar to three‐dimensional bubble are resolved correctly, and some physical phenomena with increasing Mach number are reported. Copyright © 2012 John Wiley & Sons, Ltd.

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“…The 3D shock-bubble interactions problem is resolved properly. The similar flow features like vortex rings are also observed in the experimental and numerical results of [33,34].…”

supporting

confidence: 81%

A high‐resolution method for compressible two‐fluid flows and simulation of three‐dimensional shock–bubble interactions

Zheng

Lee

2012

Numerical Methods in Fluids

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“…This topological transformation, the most distinctive feature of a shock encounter with a lobed RG, results from shear induced by the enhanced post shock speed inside the lobe (e.g., Enßlin & Brüggen 2002;Pfrommer & Jones 2011). In laboratory settings shocks in air striking helium bubbles have, for example, created analogous vortex rings (e.g., Ranjan et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Simulated Interactions between Radio Galaxies and Cluster Shocks. II. Jet Axes Orthogonal to Shock Normals

Nolting

Jones

O'Neill

et al. 2019

ApJ

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We report a 3D MHD simulation study of the interactions between radio galaxies and galaxy-clustermedia shocks in which the incident shock normals are orthogonal to the bipolar AGN jets. Before shock impact, light, supersonic jets inflate lobes (cavities) in a static, uniform ICM. We examine three AGN activity scenarios: 1) continued, steady jet activity; 2) jet source cycled off coincident with shock/radio lobe impact; 3) jet activity ceased well before shock arrival (a "radio phoenix" scenario). The simulations follow relativistic electrons (CRe) introduced by the jets, enabling synthetic radio synchrotron images and spectra. Such encounters can be decomposed into an abrupt shock transition and a subsequent long term post shock wind. Shock impact disrupts the pre-formed, low density RG cavities into two ring vortices embedded in the post shock wind. Dynamical processes cause the vortex pair to merge as they propagate downwind somewhat faster than the wind itself. When the AGN jets remain active ram pressure bends the jets downwind, generating a narrow angle tail morphology aligned with the axis of the vortex ring. The deflected jets do not significantly alter dynamical evolution of the vortex ring. However, active jets and their associated tails do dominate the synchrotron emission, compromising the observability of the vortex structures. Downwind-directed momentum concentrated by the jets impacts and alters the post-encounter shock. In the "radio phoenix" scenario, no DSA of the fossil electron population is required to account for the observed brightening and flattening of the spectra, adiabatic compression effects are sufficient. arXiv:1909.08721v1 [astro-ph.HE]

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“…In addition to the single-mode interface, spherical and cylindrical interfaces were also extensively investigated as the most classical categories of the RMI. The soap film technique was adopted in most experiments to generate the spherical gas interface with or without support (Haas & Sturtevant 1987;Hosseini & Takayama 2005;Ranjan et al 2005Ranjan et al , 2008Layes, Jourdan & Houas 2009;Zhai et al 2011;Haehn et al 2012;Si et al 2012) to study the shock-bubble interaction. The shock phenomena, such as shock refraction, diffraction and focusing, were also discussed, using acoustic theory (Haas & Sturtevant 1987) and high-speed diagnostic technique (Zhai et al 2011), for example.…”

Section: Introductionmentioning

confidence: 99%

On the interaction of a planar shock with an polygon

Luo

Wang

et al. 2015

J. Fluid Mech.

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The interaction of a planar shock wave (M ≈ 1.2) with an SF 6 polygonal inhomogeneity surrounded by air is experimentally investigated. Six polygons including a square, two types of rectangle, two types of triangle, and a diamond are generated by the soap film technique developed in our previous work, in which thin pins are used as angular vertexes to avoid the pressure singularities caused by the surface tension. The evolutions of the shock-accelerated SF 6 polygons are captured by a high-speed schlieren system from which wave systems and the interface characteristics can be clearly identified. Both regular and irregular refraction phenomena are observed outside the volume, and more complex wave patterns, including transmitted shock, refracted shock, Mach stem and the interactions between them, are found inside the volume. Two typical irregular refraction phenomena (free precursor refraction, FPR, and free precursor von Neumann refraction, FNR) are observed and analysed, and the transition from FPR to FNR is found, providing the experimental evidence for the transition between different wave patterns numerically found in the literature. Combined with our previous work (Zhai et al., J. Fluid Mech., vol. 757, 2014, pp. 800-816), the reciprocal transitions between FPR and FNR are experimentally confirmed. The velocities and trajectories of the triple points are further measured and it is found that the motions of the triple points are self-similar or pseudo-stationary. Besides the shock dynamics phenomena, the evolutions of these shocked heavy polygonal volumes, which are quite different from the light ones, are captured and found to be closely related to their initial shapes. Specifically, for square and rectangular geometries, the different width-height ratios result in different behaviours of shock-shock interaction inside the volume, and subsequently different features for the outward jet and the interface. Quantitatively, the time-variations of the interface scales, such as the width and the normalized displacements of the edges, are obtained and compared with those from previous work. The comparison illustrates the superiority of the interface formation method and the significant effect of the initial interface shape on the interface features. Furthermore, the characteristics of the vortex core, including the velocity and vortex spacing, are experimentally measured, and the vortex velocity is compared with those from some circulation models to check the † Email address for correspondence: sanjing@ustc.edu.cn Interaction of planar shock waves with SF 6 polygons 367 validity of the models. The results in the present work enrich understanding of the shock refraction phenomenon and the database of research into Richtmyer-Meshkov instability (RMI).

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Shock-bubble interactions: Features of divergent shock-refraction geometry observed in experiments and simulations

Cited by 92 publications

References 44 publications

A high‐resolution method for compressible two‐fluid flows and simulation of three‐dimensional shock–bubble interactions

A high‐resolution method for compressible two‐fluid flows and simulation of three‐dimensional shock–bubble interactions

Simulated Interactions between Radio Galaxies and Cluster Shocks. II. Jet Axes Orthogonal to Shock Normals

On the interaction of a planar shock with an polygon

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