Jet and vortex flow induced by anisotropic blast wave: experimental and computational study

Svetsov, V. V.; Popova, Marina; Rybakov, V. A.; Artemiev, V. I.; Medveduk, S. A.

doi:10.1007/s001930050087

Cited by 44 publications

(10 citation statements)

References 7 publications

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“…Vorticity generation by the differential blast strength has been connected to vorticity production in other configurations as well (Svetsov et al 1997;Bane et al 2015); for the present case, analysis indicates that a large portion is cancelled by the postshock rarefaction. We also note that while this idealized spherical-cylindrical geometry facilitates analysis, shock generation of vorticity does not depend on it specifically, only on the increasing shock strength away from the end of the kernel.…”

Section: Vorticity Generation By the Shocksupporting

confidence: 49%

“…Laser ablation of a solid surface produces a plume that ejects hot gas away from the target, which has also been attributed to over-expansion (Harilal et al 2012). A different proposal is that the curved shock generated by the expanding plasma produces the vorticity (Svetsov et al 1997), which was subsequently developed into a model for ejections from laser-induced breakdowns (Massa & Freund 2016). The relative contributions of the curved shock and overexpansion, however, have not been studied quantitatively.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic ejection caused by laser-induced optical breakdown

2020

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Section: Vorticity Generation By the Shocksupporting

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Hydrodynamic ejection caused by laser-induced optical breakdown

2020

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“…However, if the shock is perturbed via the change of parameters of the media where it propagates, it can amplify resulting in reorganization of its initially stable state in the form of a secondary flow or transition to another stable state. Such a situation can be modeled with a planar shock wave interacting with an interface that was spatially disturbed as a result of, for example, Rayleigh-Taylor (RT) instability or the anisotropic effects having a place during the initial phase of a discharge-induced bubble explosion [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Shock Wave Instability Induced on a Periodically Disturbed Interface With Plasma

Markhotok

2018

IEEE Trans. Plasma Sci.

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The shock wave instability induced when interacting with a small waviness on an interface was investigated analytically and numerically. The perturbation to the shock was phenomenologically treated assuming this as the consequence of the shock refraction. The instability develops in the form of wave-like stretchings into the lower density medium followed with the loss of stability in the flow behind it, and eventually evolving into an intense vortex structure. The instability mode is aperiodical and unconditional, and either a transition to another stable state or continuous development as a secondary flow is possible. Among other interesting features are: a similarity law in the spatial and temporal evolution of the perturbations with respect to the interface curvature; the instability locus independence of the gas density distribution thus identifying the interface conditions as the sole triggering factor; the role of the density gradient in the instability evolution discriminating between qualitatively different outcomes; and the possibility of decay via non-viscous dumping mechanisms. The phenomenological connection between the shock and the interface stability is discussed.

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“…It is noted that the ideal gas assumption is reasonably valid in air for shock pressures less than 10 atm. Svetsov et al 2 experimentally and numerically studied the uid motion due to a laser discharge and the results exhibited a vortex ring due to an initial asymmetry. Steiner et al 12 presented a real gas model simulation with a self-similar strong shock solution as the initial condition.…”

mentioning

confidence: 97%

Laser Energy Deposition in Quiescent Air

et al. 2003

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Laser energy deposition in quiescent air has been studied experimentally and numerically. The study is focused on the gasdynamic effects of the laser energy spot on the ow structure. A Gaussian pro le for initial temperature distribution is proposed to model the energy spot assuming the density is initially uniform. A ltered Rayleigh scattering technique has been used for obtaining the experimental results. These consisted of ow visualization of the blast wave, and simultaneous pressure, temperature, and velocity measurements. Good agreement has been achieved between numerical and experimental results for shock radius vs time. The comparison of computed and experimental density, pressure, temperature, and velocity outside the laser spot show good agreement as well. Nomenclature a 1 = ambient speed of sound B = optics calibration constant C = constant dark level O k 0 = observed light wave unit vector O k L = incident light wave unit vector l .º/ = laser spectral distribution Mo = molecular mass M s = shock Mach number Pr = Prandtl number p = pressure Q = optics calibration constant R = gas constant R 0= focal radius r = Rayleigh scattering (RS) distribution, radius r 0 = radius S = the grayscale value collected at a particular pixel of the image T = temperature t .º/ = absorption pro le V = ow velocity vector V 0 = focal volume V s = shock velocity x = nondimensional frequency in RS y = ratio of collisional frequency to the acoustic spatial frequency in RS ® R = Rosseland mean absorption coef cient 1T = temperature variation due to energy addition 1T 0 = peak temperature variation due to energy addition 1º D = Doppler shift ² = absorption coef cient · = constant thermal conductivity = wavelength of incident light ¹ = dynamic viscosity º = frequency º 0 = incoming light frequency ½ = density ¾ s = Stefan-Boltzmann constant, 5:67 £ 10 ¡8 W/K 4 m 2 µ = angle between the incident and scattered wave vectors Subscript

show abstract

Jet and vortex flow induced by anisotropic blast wave: experimental and computational study

Cited by 44 publications

References 7 publications

Hydrodynamic ejection caused by laser-induced optical breakdown

Hydrodynamic ejection caused by laser-induced optical breakdown

A Shock Wave Instability Induced on a Periodically Disturbed Interface With Plasma

Laser Energy Deposition in Quiescent Air

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