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The effect of wall-normal gravity on particle-laden near-wall turbulence

Published online by Cambridge University Press:  25 June 2019

Junghoon Lee  and
Changhoon Lee Open the ORCID record for Changhoon Lee [Opens in a new window]
Junghoon Lee
Affiliation:
Department of Computational Science and Engineering, Yonsei University, Seoul 03722, Korea
Changhoon Lee*
Affiliation:
Department of Computational Science and Engineering, Yonsei University, Seoul 03722, Korea Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
*
†Email address for correspondence: clee@yonsei.ac.kr
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Abstract

We performed two-way coupled direct numerical simulations of turbulent channel flow with Lagrangian tracking of small, heavy spheres at a dimensionless gravitational acceleration of 0.077 in wall units, which is based on the flow condition in the experiment by Gerashchenko et al. (J. Fluid Mech., vol. 617, 2008, pp. 255–281). We removed deposited particles after several collisions with the lower wall and then released new particles near the upper wall to observe direct interactions between particles and coherent structures of near-wall turbulence during gravitational settling through the mean shear. The results indicate that when the Stokes number is approximately 1 on the basis of the Kolmogorov time scale of the flow ($St_{K}\approx 1$), the so-called preferential sweeping occurs in association with coherent streamwise vortices, while the effect of crossing trajectories becomes significant for $St_{K}>1$. Consequently, in either case, the settling particles deposit on the wall without strong accumulation in low-speed streaks in the viscous sublayer. When particles settle through near-wall turbulence from the upper wall, more small-scale vortical structures are generated in the outer layer as low-speed fluid is pulled farther in the direction of gravity, while the opposite is true near the lower wall.

JFM classification

Multiphase and Particle-laden Flows: Particle/fluid flow Turbulent Flows: Turbulence simulation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 873 , 25 August 2019 , pp. 475 - 507
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Copyright
© 2019 Cambridge University Press 

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