Particle-resolved simulations of shock-induced flow through particle clouds at different Reynolds numbers

Andreas Nygård Osnes, Magnus Vartdal, Marianne Gjestvold Omang, and Bjørn Anders Pettersson Reif

Phys. Rev. Fluids 5, 014305 – Published 27 January 2020

Abstract

This study investigates the Reynolds-number dependence of shock-induced flow through stationary particle clouds at 10% volume fraction, using ensemble-averaged results from three-dimensional particle-resolved large eddy simulations. The advantage of using large eddy simulations to study this problem is that they capture the strong velocity shears and flow separation caused by the no-slip condition at the particle surfaces. The shock particle cloud interaction produces a reflected shock wave, whose strength increases with decreasing particle Reynolds number. This results in important changes to the flow field that enters the particle cloud. The results show an approximate proportionality between the mean flow velocity and the flow fluctuation magnitudes. Maximum particle drag forces are in excellent agreement with previous inviscid studies, and we complement these results with statistics of time-averaged particle forces as well as the variation of temporal oscillations. The results of this work provide a basis for development of improved simplified dispersed flow models.

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Received 21 June 2019

DOI:https://doi.org/10.1103/PhysRevFluids.5.014305

Physics Subject Headings (PhySH)

Particle-laden flows Shock waves

Fluid Dynamics

Authors & Affiliations

Andreas Nygård Osnes ^1,2,*, Magnus Vartdal ^2,†, Marianne Gjestvold Omang ^3,4,‡, and Bjørn Anders Pettersson Reif^1,§

¹Department of Technology Systems, University of Oslo, P.O. Box 70 Kjeller, NO-2027 Kjeller, Norway
²Norwegian Defence Research Establishment, P.O. Box 25, NO-2027 Kjeller, Norway
³Norwegian Defence Estates Agency, P.O. Box 405 Sentrum, NO-0103 Oslo, Norway
⁴Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo, Norway

^*Andreas-Nygard.Osnes@ffi.no
^†Magnus.Vartdal@ffi.no
^‡m.g.omang@astro.uio.no
^§b.a.p.reif@its.uio.no

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Vol. 5, Iss. 1 — January 2020

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