On the ongoing quest to pinpoint the location of RR-MR transition in blast wave reflections

Kleine, H.; Timofeev, Edward N.; Gojani, Ardian B.; Tetreault-Friend, Melanie; Takayama, K.

doi:10.1007/978-3-540-85181-3_107

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Numerical simulations indicate that in its early stages the Mach stem may only be a few micrometers long [6], which is undetectable with typical optical visualisation systems, even if high-resolution recording material is used. Higher image magnification improves the spatial resolution and allows one to resolve smaller features, but while this approach reduces the aforementioned discrepancy between predicted transition point and first detection of a Mach stem, imaging limitations do not allow one to eliminate it [9]. Currently, neither single image nor time-resolved visualizations are capable to detect minuscule flow features with a characteristic length below ∼ 0.05 mm, such as, in this case, the Mach stem.…”

Section: Introductionmentioning

confidence: 88%

On the Influence of Reynolds Number on the Mach Stem Height at Shock Reflection from a Circular Cylinder

Timofeev

Hakkaki-Fard

Kleine

et al. 2015

29th International Symposium on Shock Waves 2

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Section: Introductionmentioning

confidence: 88%

On the Influence of Reynolds Number on the Mach Stem Height at Shock Reflection from a Circular Cylinder

Timofeev

Hakkaki-Fard

Kleine

et al. 2015

29th International Symposium on Shock Waves 2

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Fundamental review on collision of blast waves

Almustafa

Nehdi

2023

Physics of Fluids

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The introduction and pinnacle of colliding blast waves research commenced in the 1950's following World War II. Since then, sporadic studies have appeared throughout the literature up until the early 1990s beyond which a significant contributory gap on the topic ensued. With the interminable proactivity of modern civil and aerospace defense research in the past several decades, investigations on the phenomena of blast wave collisions have fallen behind in comparison. Recent events and applications of offensive and defensive operations have slowly begun to rekindle studies on colliding blast waves in the last few years. However, there remains limitations on the extent of analyses which have yet to be adequately addressed. This review attempts to critically compile and analyze all existing research on blast wave collisions to identify pertinent shortcomings of the present state-of-the-art. In addition, related investigations of colliding shock waves and the collision of shock waves and blast waves are also provided to further elaborate on their distinctions to colliding blast waves. Prior to such discussions, the fundamentals of blast wave behaviors in terms of their characteristics, formation, and propagation are presented to pave a background to subsequent advanced topics. Lastly, unique classifications of direct and indirect applications of blast wave collisions are presented with modern perspectives. As a result, a classical problem is reawakened towards understanding and addressing highly complex and dynamic shock wave systems in defense applications.

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Decay behavior and internal interactions of regularly reflected spherical blast waves

Almustafa,

Nehdi

2024

Physics of Fluids

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Blast wave reflection is a critical area in military and infrastructure defense, converging shock dynamics, and colliding blast waves. While irregular blast reflections have garnered remarkable attention, research on regularly reflected (RR) blast waves remains comparatively limited. This study presents a detailed literature on shortcomings of post-reflection quantities of RR blast waves and aims to bridge this gap by extensively analyzing RR behaviors of spherical blast waves against a planar surface in air via numerical methods. With 31 scenarios involving a 1 kg charge and scaled distances from 0.5 to 4.0 m/kg1/3, comprehensive field data on parameters including pressure, density, and velocity were gathered using a fan-like gauge array. A dedicated program for tracking the RR shock front was developed, enabling precise trajectory detection and detailed quantitative analyses of RR wave decay. First, accurate empirical trajectory equations for RR waves were formulated along its normal axis. Second, spatial decay analysis was conducted, revealing consistent decay rates for each RR field parameter under 1 m/kg1/3 and diminishing decay rates beyond this threshold. Third, parameter profiles preceding RR shock fronts at various post-reflection distances were examined, while discrepancies and complexities against generalized profiles were uncovered. Qualitatively, this study identified four internal interactions within the reflection phenomenon, categorized by scaled distance ranges, and elucidated the secondary wave's impact on RR wave propagation. The comprehensive quantitative and qualitative findings in this work offer profound insights into blast wave dynamics, addressing several gaps on RR blast wave behaviors and laying a foundation for understanding more complex blast reflection phenomena crucial in various domains.

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On the ongoing quest to pinpoint the location of RR-MR transition in blast wave reflections

Cited by 4 publications

References 7 publications

On the Influence of Reynolds Number on the Mach Stem Height at Shock Reflection from a Circular Cylinder

On the Influence of Reynolds Number on the Mach Stem Height at Shock Reflection from a Circular Cylinder

Fundamental review on collision of blast waves

Decay behavior and internal interactions of regularly reflected spherical blast waves

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