“Thermal layer” effect in MHD: Interaction of a parallel shock with a layer of decreased density

Aleksandrov, P. E.

doi:10.1007/bf02115886

Shock Waves

1993

DOI: 10.1007/bf02115886

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“Thermal layer” effect in MHD: Interaction of a parallel shock with a layer of decreased density

P. E. Aleksandrov

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Plane blast wave interaction with an elongated straight and inclined heat-generated inhomogeneity

2018

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The unstable evolution of an elongated elliptically shaped inhomogeneity that is embedded in ambient air and aligned both normal and at an angle to an incident plane blast wave of impact Mach number 2.15 is investigated both experimentally and numerically. The elliptic inhomogeneities and the blast waves are generated using gas heating and exploding wire technique and their interaction is captured optically using shadowgraph method. While two symmetric counter-rotating vortices due to Richtmyer–Meshkov instability are observed for the straight interaction, the formation of a train of vortices similar to Kelvin–Helmholtz instability, introducing asymmetry into the flow field, are observed for an inclined interaction. During the early phase of the interaction process in the straight case, the growth of the counter-rotating vortices (based on the sequence of images obtained from the high-speed camera) and circulation (calculated with the aid of numerical data) are found to be linear in both space and time. Moreover, the normalized circulation is independent of the inhomogeneity density and the ellipse thickness, enabling the formulation of a unique linear fit equation. Conversely, the circulation for an inclined case follows a quadratic function, with each vortex in the train estimated to move with a different velocity directly related to its size at that instant. Two factors influencing the quadratic nature are identified: the reduction in strength of the transmitted shock thereby generating vortices with reduced vorticity, along with the gradual loss of vorticity of the earlier-generated vortices.

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Plane blast wave interaction with an elongated straight and inclined heat-generated inhomogeneity

2018

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Shock polar analyses of regular reflections in magnetohydrodynamics

1995

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The ‘‘total pressure-deflection angle’’ shock polars are obtained to apply to magnetohydrodynamic (MHD) shock reflection problems. They are categorized into four kinds, based on the type of shocks; the conditions for their appearance are given as well. Among several possible reflections, the regular reflection phenomena are studied here using shock polars, revealing that only four incident-reflection combinations are possible for regular reflection. The range of upstream conditions giving a specified-combination regular reflection is shown graphically. Simultaneously, the relations among three types of incident shock and four kinds of reflected shock polars are also exhibited graphically.

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“Thermal layer” effect in MHD: Interaction of a parallel shock with a layer of decreased density

Cited by 2 publications

References 1 publication

Plane blast wave interaction with an elongated straight and inclined heat-generated inhomogeneity

Plane blast wave interaction with an elongated straight and inclined heat-generated inhomogeneity

Shock polar analyses of regular reflections in magnetohydrodynamics

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