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Flow modulation by a few fixed spherical particles in a turbulent channel flow

Published online by Cambridge University Press:  09 December 2019

Cheng Peng ,
Orlando M. Ayala  and
Lian-Ping Wang Open the ORCID record for Lian-Ping Wang [Opens in a new window]
Cheng Peng
Affiliation:
Department of Mechanical Engineering, University of Delaware, Newark, DE19716, USA
Orlando M. Ayala
Affiliation:
Department of Engineering Technology, Old Dominion University, Norfolk, VA23529, USA
Lian-Ping Wang*
Affiliation:
Department of Mechanical Engineering, University of Delaware, Newark, DE19716, USA Center for Complex Flows and Soft Matter Research and Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen518055, Guangdong, China
*
†Email addresses for correspondence: lwang@udel.edu, wanglp@sustech.edu.cn
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Abstract

Current understanding of turbulence modulation by solid particles is incomplete as making reliable predictions on the nature and level of modulation remains a challenging task. Multiple modulation mechanisms may be simultaneously induced by particles, but the lack of reliable methods to identify these mechanisms and quantify their effects hinders a complete understanding of turbulence modulation. In this work, we present a full analysis of the turbulent kinetic energy (TKE) equation for a turbulent channel flow laden with a few fixed particles near the channel walls, in order to investigate how the wall generated turbulence interacts with the particles and how, as a result, the global turbulence statistics are modified. All terms in the budget equations of total and component-wise TKEs are explicitly computed using the data from direct numerical simulations. Particles are found to modify turbulence by two competing mechanisms: the reduction of the intrinsic turbulence production associated with a reduced mean shear due to the resistance imposed by solid particles (the first mechanism), and an additional TKE production mechanism by displacing incoming fluid (the second mechanism). The distribution of TKE in the wall-normal direction is also made more homogeneous due to the significantly enhanced pressure transport of TKE. Finally, the budget analysis of component-wise TKE reveals an enhanced inter-component TKE transfer due to the presence of particles, which leads to a more isotropic distribution of TKE among three velocity components.

JFM classification

Multiphase and Particle-laden Flows: Particle/fluid flow Turbulent Flows: Turbulence simulation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 884 , 10 February 2020 , A15
Copyright
© 2019 Cambridge University Press

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