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Numerical simulation of particle dispersion in a spatially-developing mixing layer

Numerical simulation of particle dispersion in a spatially-developing mixing layer
Numerical simulation of particle dispersion in a spatially-developing mixing layer
Although there have been several numerical studies on particle dispersion in mixing layers, most of them have been conducted for temporally evolving mixing layers. In this study, numerical simulations of a spatially developing mixing layer are performed to investigate particle dispersion under various conditions. The full compressible Navier–Stokes equations are solved with a high-order compact finite difference scheme, along with high-order time-integration. Accurate non-reflecting boundary conditions for the fluid flow are used, and several methods for introducing particles into the computational domain are tested. The particles are traced using a Lagrangian approach assuming one-way coupling between the continuous and the dispersed phases. The study focuses on the roles of the large-scale vortex structures in particle dispersion at low, medium and high Stokes numbers, which highlights the important effects of interacting vortex structures in nearby regions in the spatially developing mixing layer. The effects of particles with randomly distributed sizes (or Stokes numbers) are also investigated. Both instantaneous flow fields and statistical quantities are analyzed, which reveals essential features of particle dispersion in spatially developing free shear flows, which are different from those observed in temporally developing flows. The inclusion of the gravity not only modifies the overall dispersion patterns, but also enhances stream-crossing by particles.
0935-4964
403-420
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Luo, Xiaoyu
3eb0af38-9017-4e1f-a10d-8a0ded2ccc8b
Luo, Kai H.
86f52a13-fdcd-40e4-8344-a6fe47c4e16b
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Luo, Xiaoyu
3eb0af38-9017-4e1f-a10d-8a0ded2ccc8b
Luo, Kai H.
86f52a13-fdcd-40e4-8344-a6fe47c4e16b

Hu, Zhiwei, Luo, Xiaoyu and Luo, Kai H. (2002) Numerical simulation of particle dispersion in a spatially-developing mixing layer. Theoretical and Computational Fluid Dynamics, 15 (6), 403-420. (doi:10.1007/s00162-002-0058-9).

Record type: Article

Abstract

Although there have been several numerical studies on particle dispersion in mixing layers, most of them have been conducted for temporally evolving mixing layers. In this study, numerical simulations of a spatially developing mixing layer are performed to investigate particle dispersion under various conditions. The full compressible Navier–Stokes equations are solved with a high-order compact finite difference scheme, along with high-order time-integration. Accurate non-reflecting boundary conditions for the fluid flow are used, and several methods for introducing particles into the computational domain are tested. The particles are traced using a Lagrangian approach assuming one-way coupling between the continuous and the dispersed phases. The study focuses on the roles of the large-scale vortex structures in particle dispersion at low, medium and high Stokes numbers, which highlights the important effects of interacting vortex structures in nearby regions in the spatially developing mixing layer. The effects of particles with randomly distributed sizes (or Stokes numbers) are also investigated. Both instantaneous flow fields and statistical quantities are analyzed, which reveals essential features of particle dispersion in spatially developing free shear flows, which are different from those observed in temporally developing flows. The inclusion of the gravity not only modifies the overall dispersion patterns, but also enhances stream-crossing by particles.

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Published date: July 2002

Identifiers

Local EPrints ID: 23108
URI: http://eprints.soton.ac.uk/id/eprint/23108
ISSN: 0935-4964
PURE UUID: 322c622b-5341-4b2c-88aa-2e9c4ffcf07f

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Date deposited: 28 Mar 2006
Last modified: 15 Jul 2019 19:21

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