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Explanation of differences in experimental and computational results for the preferential concentration of inertial particles

Explanation of differences in experimental and computational results for the preferential concentration of inertial particles
Explanation of differences in experimental and computational results for the preferential concentration of inertial particles

Using one-way coupled direct numerical simulations of inertial particles in homogeneous isotropic turbulence we investigate the non-linear dependence of local particle concentrations in particle clusters on the number density of particles used in the simulation per volume. We show that the Reynolds-number dependence of local concentrations in clusters can be predicted for sufficiently high Reynolds numbers by a scaling relation that depends on the average particle number density and the Kolmogorov length. Depending on the average particle number density and gravity, a maximum of preferential concentration does not necessarily occur at Stokes numbers around unity. This explains the differences observed between recent experimental and computational results.

Inertial particles, Preferential concentration, Turbulence
0045-7930
37-41
Wittemeier, Thorsten
7389419e-de70-4f43-84f6-823d5827bc72
Shrimpton, John S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Wittemeier, Thorsten
7389419e-de70-4f43-84f6-823d5827bc72
Shrimpton, John S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af

Wittemeier, Thorsten and Shrimpton, John S. (2018) Explanation of differences in experimental and computational results for the preferential concentration of inertial particles. Computers and Fluids, 173, 37-41. (doi:10.1016/j.compfluid.2018.03.078).

Record type: Article

Abstract

Using one-way coupled direct numerical simulations of inertial particles in homogeneous isotropic turbulence we investigate the non-linear dependence of local particle concentrations in particle clusters on the number density of particles used in the simulation per volume. We show that the Reynolds-number dependence of local concentrations in clusters can be predicted for sufficiently high Reynolds numbers by a scaling relation that depends on the average particle number density and the Kolmogorov length. Depending on the average particle number density and gravity, a maximum of preferential concentration does not necessarily occur at Stokes numbers around unity. This explains the differences observed between recent experimental and computational results.

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Explanation of differences in experimental and computational results - Accepted Manuscript
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Accepted/In Press date: 28 March 2018
e-pub ahead of print date: 3 April 2018
Published date: 15 September 2018
Keywords: Inertial particles, Preferential concentration, Turbulence

Identifiers

Local EPrints ID: 421199
URI: http://eprints.soton.ac.uk/id/eprint/421199
ISSN: 0045-7930
PURE UUID: c5978dff-47e6-4290-afb0-c6fefa6753c0
ORCID for Thorsten Wittemeier: ORCID iD orcid.org/0000-0002-6207-8255

Catalogue record

Date deposited: 24 May 2018 16:30
Last modified: 26 Nov 2021 05:22

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Contributors

Author: Thorsten Wittemeier ORCID iD

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