Journal
JOURNAL OF FLUID MECHANICS
Volume 954, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2022.982
Keywords
particle/fluid flow; turbulence simulation
Categories
Funding
- National Science Foundation [1854376, W911NF-18-1-0356]
- Army Research Office [1854376]
- Swedish Research Council (VR) through the INTERFACE research environment [VR 2016-06119]
- Okinawa Institute of Science and Technology Graduate University (OIST)
- Cabinet Office, Government of Japan
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This study investigates turbulent suspension flows of non-Brownian, non-colloidal, neutrally buoyant and rigid spherical particles in a Newtonian fluid over porous media. The results show that the presence of particles in the free-flow region affects the mean velocity and concentration profiles due to variations in slip velocity and wall-normal fluctuations at the suspension-porous interface. The stress condition at the interface significantly influences the particle near-wall dynamics and migration towards the channel core, leading to large modulations of the overall flow drag.
This study discusses turbulent suspension flows of non-Brownian, non-colloidal, neutrally buoyant and rigid spherical particles in a Newtonian fluid over porous media with particles too large to penetrate and move through the porous layer. We consider suspension flows with the solid volume fraction Phi(b) ranging from 0 to 0.2, and different wall permeabilities, while porosity is constant at 0.6. Direct numerical simulations with an immersed boundary method are employed to resolve the particles and flow phase, with the volume-averaged Navier-Stokes equations modelling the flow within the porous layer. The results show that in the presence of particles in the free-flow region, the mean velocity and the concentration profiles are altered with increasing porous layer permeability because of the variations in the slip velocity and wall-normal fluctuations at the suspension-porous interface. Furthermore, we show that variations in the stress condition at the interface significantly affect the particle near-wall dynamics and migration toward the channel core, thereby inducing large modulations of the overall flow drag. At the highest volume fraction investigated here, Phi(b) = 0.2, the velocity fluctuations and the Reynolds shear stress are found to decrease, and the overall drag increases due to the increase in the particle-induced stresses.
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