Investigation of the interaction of a blast wave with an internal structure

Marconi, F.

doi:10.2514/3.12144

Cited by 21 publications

(6 citation statements)

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“…Apart from a couple of pioneering studies 23,24 that were limited to "pure" gas (no dispersed solid mass), this important category of problems has not received the attention it deserves. Additional experimental and (especially) computational studies are needed to provide detailed analysis of such flow fields and to allow increased understanding for improved engineering design.…”

Section: Introductionmentioning

confidence: 99%

On the propagation and multiple reflections of a blast wave travelling through a dusty gas in a closed box

2017

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This version is available at https://strathprints.strath.ac.uk/60148/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Accepted for Publication in the Physics of Fluids -10 March 20171 On the propagation and multiple reflections of a blast wave travelling through a dusty gas in a closed box Abstract: This paper concerns the propagation of shock waves in an enclosure filled with dusty gas. The main motivation for this problem is to probe the effect on such dynamics of solid particles dispersed in the fluid medium. This subject, which has attracted so much attention over recent years given its important implications in the study of the structural stability of systems exposed to highenergy internal detonations, is approached here in the framework of a hybrid numerical two-way coupled Eulerian-Lagrangian methodology. In particular, insights are sought by considering a relatively simple archetypal setting corresponding to a shock wave originating from a small spherical region initialized on the basis of available analytic solutions. The response of the system is explored numerically with respect to several parameters, including the blast intensity (via the related value of the initial shock Mach number), the solid mass fraction (mass load), and the particle size (Stokes number). Results are presented in terms of pressure-load diagrams. Beyond practical applications, it is shown that a kaleidoscope of fascinating patterns is produced by the "triadic" relationships among multiple shock reflections events and particle-fluid and particle-wall interaction dynamics. These would be of great interest to researchers and scientists interested in fundamental problems relating to the general theory of pattern formation in complex nonlinear multiphase systems.

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Section: Introductionmentioning

confidence: 99%

On the propagation and multiple reflections of a blast wave travelling through a dusty gas in a closed box

2017

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“…Previous investigations pertinent to Richtmyer-Meshkov instability under various flow conditions, e.g. shock/density-interface interaction (16) , blast wave propagation in an enclosure (15) and flows in astrophysics (5) , have also employed a similar computational set-up. The above studies have shown that although a two dimensional model cannot represent three-dimensional effects on the small-scale processes, insight in relation to a number of physical phenomena can still be gained on the basis of two-dimensional simulations.…”

Section: Computational Modellingmentioning

confidence: 99%

“…An explosion is initiated at the centre of a square enclosure and a cylindrical blast wave moves into a gas at rest of ambient density and pressure of 1⋅21kg/m 3 and 1⋅013bar, respectively. The enclosure is a square and the unperturbed, perfectly symmetric blast has been obtained considering that the flow is essentially cylindrical before the blast interacts with the walls (15,19) . To generate the initial cylindrical blast, the one- the frames have been plotted using a dimensionless time step ∆t = 0⋅0855 except for the last two rows where ∆t = 0⋅855.…”

Section: Problem Descriptionmentioning

confidence: 99%

“…instabilities in spherical ideal gas expansion. Furthermore Marconi (15) performed a numerical investigation of the propagation of a blast wave of in an enclosure and detected the formation of instability following the reflection of the blast wave from the walls of the structure.…”

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confidence: 99%

“…Because of the lack of detailed experiments for internal explosions, numerical simulations provide an alternative for studying complex shock physics in these flows. In the present work, the problem set-up is the same as that employed by Marconi (15) . This consists of an enclosure in which an explosion takes place around its centre (Fig.…”

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Shock-wave induced instability in internal explosion dynamics

Bagabir

Drikakis

2005

Aeronaut. j.

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The study of non-stationary flows featuring shock waves is motivated by the need to understand the physics of shock wave phenomena, as well as by the variety of applications in which shock waves appear spanning from engineering to astrophysics. In the case of shock (blast) wave propagation in an enclosure the interest stems from explosion dynamics which arises from the very sudden release of chemical, nuclear, electrical or mechanical energy in a limited space.Even though past studies have investigated instabilities occurring when two fluids of different densities are impulsively accelerated into each other by a shock wave, known as Richtmyer-Meshkov (or impulsive Rayleigh-Taylor) instability (6,18) , the investigation of flow instabilities arising from the interaction of blast waves with a solid structure has received scarce attention. Flow instabilities have been experimentally detected in the case of cylindrical blast waves (7,14) . Burrows and Fryxell (1992) (5) have also shown that instabilities can occur in the mantles of nascent neutron stars implying that the standard spherically symmetric models of neutron star birth and supernova explosion may be inadequate. The above findings follow earlier analytical work (4) regarding the formation of convective ABSTRACT The paper presents an investigation of flow instabilities occurring in shock-wave propagation and interaction with the walls of an enclosure. The shock-wave propagation is studied in connection with perturbed and unperturbed cylindrical blasts, initially placed in the centre of the enclosure, as well as for three different blast intensities corresponding to Mach numbers M s = 2, 5 and 10. The instability is manifested by a symmetry-breaking of the flow even for the case of an initially perfectly-symmetric blast. It is shown that the symmetry-breaking initiates around the centre of the enclosure as a result of the interaction of the shock waves reflected from the walls, with the low-density region in the centre of the explosion. The instability leads to fast attenuation of the shock waves, especially for smaller initial blast intensities. The computations reveal that the vortical flow structures arising from the multiple shock reflections and flow instability are Mach number dependent. The existence of perturbations of large amplitude in the initial condition strengthens the instability and has significant effects on the instantaneous wall pressure distributions. The computational investigation has been performed using high-resolution Riemann solvers for the gas dynamic equations.

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Interaction of Shock Tube Generated Blast Wave with a Rectangular Object at Two Pressure Ratios: Numerical Simulations and Their Comparison

Kundu¹,

Thangadurai²

2023

Lecture Notes in Mechanical Engineering

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Investigation of the interaction of a blast wave with an internal structure

Cited by 21 publications

References 7 publications

On the propagation and multiple reflections of a blast wave travelling through a dusty gas in a closed box

On the propagation and multiple reflections of a blast wave travelling through a dusty gas in a closed box

Shock-wave induced instability in internal explosion dynamics

Interaction of Shock Tube Generated Blast Wave with a Rectangular Object at Two Pressure Ratios: Numerical Simulations and Their Comparison

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