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How does two-way coupling modify particle settling and the role of multiscale preferential sweeping?

Publication ,  Journal Article
Tom, J; Carbone, M; Bragg, AD
Published in: Journal of Fluid Mechanics
September 25, 2022

For one-way coupled (1WC) flows, Tom & Bragg (J. Fluid Mech., vol. 871, 2019, pp. 244-270) advanced the analysis of Maxey (J. Fluid Mech., vol. 174, 1987, pp. 441-465), which applied to weakly inertial particles, to particles of arbitrary inertia, and the new theoretical result revealed the role that different scales play in the preferential sweeping mechanism that leads to enhanced particle settling in turbulent flows. Monchaux & Dejoan (Phys. Rev. Fluids, vol. 2, 2017, 104302) showed using direct numerical simulations that, while for low particle loading the effect of two-way coupling (2WC) on the global flow statistics is weak, 2WC enables the particles to drag the fluid in their vicinity down with them, significantly enhancing their settling, and they argued that 2WC suppresses the preferential sweeping mechanism. We explore this further by considering the impact of 2WC on the contribution made by eddies of different sizes on the particle settling. In agreement with Monchaux & Dejoan, we show that even for low loading, 2WC strongly enhances particle settling, and we show how 2WC modifies the contribution from different flow scales. However, contrary to their study, we show that preferential sweeping remains important in 2WC flows. In particular, for both 1WC and 2WC flows, the settling enhancement due to turbulence is dominated by contributions from particles in straining regions of the flow, but for the 2WC case, the particles in these regions also drag the fluid down with them, leading to an enhancement of their settling compared with the 1WC case.

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Published In

Journal of Fluid Mechanics

DOI

EISSN

1469-7645

ISSN

0022-1120

Publication Date

September 25, 2022

Volume

947

Related Subject Headings

  • Fluids & Plasmas
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 01 Mathematical Sciences
 

Citation

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Tom, J., Carbone, M., & Bragg, A. D. (2022). How does two-way coupling modify particle settling and the role of multiscale preferential sweeping? Journal of Fluid Mechanics, 947. https://doi.org/10.1017/jfm.2022.615
Tom, J., M. Carbone, and A. D. Bragg. “How does two-way coupling modify particle settling and the role of multiscale preferential sweeping?Journal of Fluid Mechanics 947 (September 25, 2022). https://doi.org/10.1017/jfm.2022.615.
Tom J, Carbone M, Bragg AD. How does two-way coupling modify particle settling and the role of multiscale preferential sweeping? Journal of Fluid Mechanics. 2022 Sep 25;947.
Tom, J., et al. “How does two-way coupling modify particle settling and the role of multiscale preferential sweeping?Journal of Fluid Mechanics, vol. 947, Sept. 2022. Scopus, doi:10.1017/jfm.2022.615.
Tom J, Carbone M, Bragg AD. How does two-way coupling modify particle settling and the role of multiscale preferential sweeping? Journal of Fluid Mechanics. 2022 Sep 25;947.
Journal cover image

Published In

Journal of Fluid Mechanics

DOI

EISSN

1469-7645

ISSN

0022-1120

Publication Date

September 25, 2022

Volume

947

Related Subject Headings

  • Fluids & Plasmas
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 01 Mathematical Sciences