Pseudo-turbulence in inviscid simulations of shock interacting with a bed of randomly distributed particles

Mehta, Yash; Jackson, T. L.; Balachandar, S.

doi:10.1007/s00193-019-00905-3

Cited by 19 publications

(27 citation statements)

References 32 publications

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“…Using inviscid three-dimensional simulations, Mehta et al (2019a) found RMS velocity fluctuations that were between 10-50% of the mean flow velocity, which is lower than the two-dimensional fluctuations at corresponding flow conditions. Mehta et al (2019a) also investigated the fluctuating internal energy advection, as well as the fluctuating pressure work. They found that the magnitudes of these terms were small compared to the corresponding mean flow fields.…”

Section: Continuous Phase Fluctuationsmentioning

confidence: 85%

“…Such approaches have recently become popular, due to the ability to include a large enough number of particles in a simulation for flow statistics to be representative of the problem at large scale. Studies that have used particle-resolved simulations for investigation of shock-wave particle cloud interaction are, e.g., ; Sridharan et al (2015); Mehta et al (2016aMehta et al ( ,b, 2018Mehta et al ( , 2019a; Das et al 2017; Sen et al (2017; ; . This is also the simulation approach that is used in papers II-IV in this thesis.…”

Section: Shock-wave Interaction With Particle Cloudsmentioning

confidence: 99%

“…Two-dimensionality limits the flow dynamics, which results in significantly stronger vorticity generation (Mehta et al, 2019a). Using inviscid three-dimensional simulations, Mehta et al (2019a) found RMS velocity fluctuations that were between 10-50% of the mean flow velocity, which is lower than the two-dimensional fluctuations at corresponding flow conditions. Mehta et al (2019a) also investigated the fluctuating internal energy advection, as well as the fluctuating pressure work.…”

Section: Continuous Phase Fluctuationsmentioning

confidence: 99%

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Numerical simulation of particle jet formation induced by shock wave acceleration in a Hele-Shaw cell

2017

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First of all I would like to thank my main supervisor, Prof. Bjørn Anders Pettersson Reif for his guidance and support throughout my Ph.D. studies. His insight and intuition for flow physics is exceptional, and we have had countless interesting discussions over the last years. He always manages to keep focus on the important questions, and this ability has shaped this thesis. I would also like to thank my other supervisors Magnus Vartdal and Marianne Gjestvold Omang. There is never a problem too difficult for Magnus, which is always inspiring for everyone around him. His involvement in the details in the studies within this thesis has been invaluable. Marianne has also provided valuable advice throughout these years. My period at the Norwegian Defence Estates Agency was very enjoyable and taught me a lot. During these years I have been fortunate to be allowed to work with the fluid dynamics group at the Norwegian Defence Research Establishment. Special thanks to Espen Åkervik, who I have shared an office with and can always ask for advice. I would also like to thank

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Section: Continuous Phase Fluctuationsmentioning

confidence: 85%

Section: Shock-wave Interaction With Particle Cloudsmentioning

confidence: 99%

Section: Continuous Phase Fluctuationsmentioning

confidence: 99%

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Numerical simulation of particle jet formation induced by shock wave acceleration in a Hele-Shaw cell

2017

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“…While some correlations obtained from experiments or particle-resolved direct numerical simulations (DNS) have a clear physical interpretation (e.g., the drag coefficient or heat transfer rate), their connection to model closure is not always obvious. This is especially true for high-speed flows whereby filtering or averaging the governing equations reveals unclosed terms that contain additional physics [35].…”

Section: Introductionmentioning

confidence: 99%

“…In the context of shock-particle interactions for moderately dilute and dense suspensions, small-scale velocity fluctuations are produced in particle interstitial sites and advected downstream with the mean flow [24,35,48] (see Fig. 1 (b)).…”

Section: Introductionmentioning

confidence: 99%

A volume-filtered description of compressible particle-laden flows

Shallcross

Fox

Capecelatro

2020

International Journal of Multiphase Flow

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In this work, we present a rigorous derivation of the volume-filtered viscous compressible Navier-Stokes equations for disperse two-phase flows. Compared to incompressible flows, many new unclosed terms appear. These terms are quantified via a posteriori filtering of two-dimensional direct simulations of shock-particle interactions. We demonstrate that the pseudo-turbulent kinetic energy (PTKE) systematically acts to reduce the local gas-phase pressure and consequently increase the local Mach number. Its magnitude varies with volume fraction and filter size, which can be characterized using a Knudsen number based on the filter size and inter-particle spacing. A transport equation for PTKE is derived and closure models are proposed to accurately capture its evolution. The resulting set of volume-filtered equations are implemented within a highorder Eulerian-Lagrangian framework. An interphase coupling strategy consistent with the volume filtered formulation is employed to ensure grid convergence. Finally PTKE obtained from the volume-filtered Eulerian-Lagrangian simulations are compared to a series of two-and three-dimensional direct simulations of shocks passing through stationary particles.

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Particle-resolved simulations of shock-induced inviscid flow through particle-curtain at initial stage

Jiang

2022

Computers & Fluids

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Pseudo-turbulence in inviscid simulations of shock interacting with a bed of randomly distributed particles

Cited by 19 publications

References 32 publications

Numerical simulation of particle jet formation induced by shock wave acceleration in a Hele-Shaw cell

Numerical simulation of particle jet formation induced by shock wave acceleration in a Hele-Shaw cell

A volume-filtered description of compressible particle-laden flows

Particle-resolved simulations of shock-induced inviscid flow through particle-curtain at initial stage

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