Shock wave diffraction over wedges, cylinders, and spheres in gases, liquids, and condensed matter

Gonor, A. L.; Gottlieb, J. J.; Hooton, Irene E.

doi:10.1063/1.1635649

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…In a study by Abe et al (2001), experimental and numerical studies of shock wave propagation over single cylinders and arrays of cylinders are discussed. Gonor et al (2004) present solutions to the problem of the initial diffraction of a planar shock wave moving along the front surface of a wedge, cylinder, and sphere for gas, liquid, and condensed matter. Bagabir and Drikakis (2004) present numerical experiments using seven high-resolution schemes for unsteady, inviscid, compressible flows, proving the results of a study by Yang et al (1987).…”

Section: Literature Reviewmentioning

confidence: 99%

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Peak overpressure and impulse due to diffraction over a cylinder and/or multi-reflection of a shock wave in structural design- Part I

Hahn

Mensinger

Rutner

2020

International Journal of Protective Structures

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The design and planning of structural components, such as columns, to resist blast loads is a complex task. Often standard free-field blast loads, specified in design codes or other literature, are used for the analysis of the object. These loads are then further increased or decreased depending on the topology of the surrounding geometry (Mach-Stem), the shape of the impacted object itself, and blast wave reflection. However, most of these research works focus purely on the assessment of the structural components itself, ignoring a complex fluid mechanics phenomenon such as diffraction, which is of particular interest when circular columns are standing next to each other or placed in front of a façade. The article addresses three main topics. First, the article answers the question whether the area behind the column is protected, meaning constituting a shadowed area. We present findings that the close area behind a column is subjected to higher pressure and impulse values as there would be without the column. Hence, the incident pressure sees significant pressure buildup due to diffraction. This pressure buildup is quantified using pressure increase factors and presented together with the accompanying impulse. Second, this pressure buildup is of relevance for realistic design of a façade behind the column, which is not covered in current design codes at all. We discuss relevant parameters in the design process. Third, directly coupled with the assessment of the pressure buildup behind the column due to diffraction is the assessment of pressure and impulse in the area behind the column due to multi-wave reflection at a façade, leading to a significant pressure and impulse scale-up, which might be relevant for design of a column and/or a façade. This article identifies gaps in understanding diffraction and subsequent multi-reflection of blast wave within a structural design framework and provides insights on how to establish safe design accounting for these effects.

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Section: Literature Reviewmentioning

confidence: 99%

“…(2001), experimental and numerical studies of shock wave propagation over single cylinders and arrays of cylinders are discussed. Gonor et al. (2004) present solutions to the problem of the initial diffraction of a planar shock wave moving along the front surface of a wedge, cylinder, and sphere for gas, liquid, and condensed matter.…”

Section: Literature Reviewmentioning

confidence: 99%

Peak overpressure and impulse due to diffraction over a cylinder and/or multi-reflection of a shock wave in structural design- Part I

Hahn

Mensinger

Rutner

2020

International Journal of Protective Structures

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“…On the other hand, shock-particle interaction is strongly time-dependent [4], [12], [26]. The particle is subjected to very strong gas acceleration as the shock wave passes over it [25], [27].…”

Section: Introductionmentioning

confidence: 99%

Investigation and quantification of flow unsteadiness in shock-particle cloud interaction

Hosseinzadeh-Nik

Subramaniam

Regele

2018

International Journal of Multiphase Flow

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This work aims to study the interaction of a shock wave with a cloud of particles to quantify flow unsteadiness and velocity fluctuations using particle-resolved direct numerical simulation (PR-DNS). Three cases are studied, with each case revealing one aspect of the intricate flow phenomena involved in this interaction. The unsteady interaction of a shock wave with a transverse array of particles reveals the origin of unsteadiness under the effect of mutual wave-wave and wave-wake interactions between the particles. In the second case, the interaction of a shock with a particle cloud is studied, with a focus on the interaction of the complex wave system with the vortical structure. A budget analysis of the vorticity equation reveals the sources of strong unsteadiness in the particle cloud. A detailed analysis of the velocity fluctuation and kinetic energy in the fluctuating motion is performed to ascertain the importance of the velocity fluctuations that arise from the strong unsteadiness. An analogous analysis is presented, in the third case, for a gradually-induced flow on the same particle cloud along with a comparison to the shock induced case to assess the impulsive effect of shock on intensity of the fluctuating field statistics.

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Die Auswirkungen von Diffraktion und Multi‐Reflexion auf zylindrische Stützen

Hahn¹,

Mensinger²,

Rutner

2020

Stahlbau

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Die umliegende Topologie einer Stütze kann einen großen Einfluss auf eine eintreffende Detonationsdruckwelle und die anschließende Bemessung haben. Effekte infolge von Diffraktion oder Mehrfach‐Reflexionen scheinen bisher nicht durch die Normen oder die Fachliteratur abgedeckt zu sein. Diese Problematik soll im vorliegenden Artikel eruiert werden. Dabei stehen drei Fragestellungen im Vordergrund. Die erste befasst sich damit, ob der Bereich hinter einer Stütze durch diese vor einer einfallenden Druckwelle geschützt (verschattet) wird. Dies ist für die Bemessung der Stütze selbst nicht von Bedeutung, sondern soll klären, ob die Belastung auf eine rückversetzte Struktur, wie z. B. eine Fassade, unter Anwendung aktueller Regelungen korrekt ermittelt werden kann. Die zweite Frage beschäftigt sich mit einer weiteren Schockfront, die sich, ausgelöst durch Diffraktion, diagonal im Raum ausbreitet. Hierbei stellt sich die gleiche Frage nach der korrekten Lastermittlung, z. B. auf eine Stütze, die in zweiter Reihe steht. Die dritte Fragestellung, die untersucht werden soll, bezieht sich auf die Lasteinwirkung auf die Rückseite einer Stütze, nachdem die Primärdruckwelle an der genannten Fassade reflektiert wurde und wieder auf die Stütze trifft. Es zeigt sich, dass eine nahe Platzierung der Stütze zu einer reflektierenden Fassade sehr große Druckeinwirkungen auf die Rückseite der Stütze zur Folge hat, für die diese evtl. nicht ausreichend bemessen wurde.

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Shock wave diffraction over wedges, cylinders, and spheres in gases, liquids, and condensed matter

Cited by 8 publications

References 6 publications

Peak overpressure and impulse due to diffraction over a cylinder and/or multi-reflection of a shock wave in structural design- Part I

Peak overpressure and impulse due to diffraction over a cylinder and/or multi-reflection of a shock wave in structural design- Part I

Investigation and quantification of flow unsteadiness in shock-particle cloud interaction

Die Auswirkungen von Diffraktion und Multi‐Reflexion auf zylindrische Stützen

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