A numerical study of particle jetting in a dense particle bed driven by an air-blast

Rahul Babu Koneru; Bertrand Rollin; Bradford DurantFrederick OuelletS. Balachandar

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A numerical study of particle jetting in a dense particle bed driven by an air-blast

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In this work, the particle jetting behavior in a blast-driven dense particle bed is studied at early times. Four-way coupled Euler-Lagrange simulations are performed using a high-order discontinuous Galerkin spectral element solver coupled with a high-order Lagrangian particle solver, wherein the inter-particle collisions are resolved using a discrete element method collision model. Following the experiments of Rodriguez et al. "Formation of particle jetting in a cylindrical shock tube," Shock Waves 23(6), 619-634 (2013) and the simulations of Osnes et al. "Numerical simulation of particle jet formation induced by shock wave acceleration in a Hele-Shaw cell," Shock Waves 28(3), 451-461 (2018), the simulations are performed in a quasi-two-dimensional cylindrical geometry (Hele-Shaw cell). Parametric studies are carried out to assess the impact of the coefficient of restitution and the strength of the incident shock on the particle jetting behavior. The deposition of vorticity through a multiphase (gas-particle) analog of Richtmyer-Meshkov instability is observed to play a crucial role in channeling the particles into well-defined jets at the outer edge of the particle bed. This is confirmed by the presence of vortex pairs around the outer jets. Furthermore, the effect of the relaxation of the relative velocity between the two phases on the vorticity generation is explored by analyzing the correlation between the radial velocity of particles and the radial velocity of the gas at the particle location.

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来源
《Physics of fluids》 |2020年第1期|093301-1-093301-17|共17页
作者
Rahul Babu Koneru; Bertrand Rollin; Bradford DurantFrederick OuelletS. Balachandar;
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作者单位

Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, USA;

Aerospace Engineering Department, Embry-Riddle Aeronautical University, Daytona Beach, Florida 32114, USA;

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原文格式 PDF
正文语种英语
中图分类流体力学;
关键词
numerical study; particle jetting; high-order discontinuous;

A numerical study of particle jetting in a dense particle bed driven by an air-blast

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