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

2019 ◽  
Vol 884 ◽  
Author(s):  
Cheng Peng ◽  
Orlando M. Ayala ◽  
Lian-Ping Wang
Keyword(s):  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Spherical Particles ◽  
Flow Modulation ◽  
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scholarly journals State prediction of an entropy wave advecting through a turbulent channel flow

2019 ◽  
Vol 882 ◽  
Author(s):  
Loizos Christodoulou ◽  
Nader Karimi ◽  
Andrea Cammarano ◽  
Manosh Paul ◽  
Salvador Navarro-Martinez
Keyword(s):  
Channel Flow ◽  
Turbulent Channel Flow ◽  
State Prediction ◽  
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A direct numerical investigation of two-way interactions in a particle-laden turbulent channel flow

2019 ◽  
Vol 875 ◽  
pp. 1096-1144 ◽  
Author(s):  
Cheng Peng ◽  
Orlando M. Ayala ◽  
Lian-Ping Wang
Keyword(s):  
Channel Flow ◽  
Finite Size ◽  
Turbulent Channel Flow ◽  
Spherical Particles ◽  
Homogeneous Distribution ◽  
Particle Sizes ◽  
Small Particles ◽  
Particle Rotation ◽  
Turbulence Modulation ◽  
Budget Analysis

Understanding the two-way interactions between finite-size solid particles and a wall-bounded turbulent flow is crucial in a variety of natural and engineering applications. Previous experimental measurements and particle-resolved direct numerical simulations revealed some interesting phenomena related to particle distribution and turbulence modulation, but their in-depth analyses are largely missing. In this study, turbulent channel flows laden with neutrally buoyant finite-size spherical particles are simulated using the lattice Boltzmann method. Two particle sizes are considered, with diameters equal to 14.45 and 28.9 wall units. To understand the roles played by the particle rotation, two additional simulations with the same particle sizes but no particle rotation are also presented for comparison. Particles of both sizes are found to form clusters. Under the Stokes lubrication corrections, small particles are found to have a stronger preference to form clusters, and their clusters orientate more in the streamwise direction. As a result, small particles reduce the mean flow velocity less than large particles. Particles are also found to result in a more homogeneous distribution of turbulent kinetic energy (TKE) in the wall-normal direction, as well as a more isotropic distribution of TKE among different spatial directions. To understand these turbulence modulation phenomena, we analyse in detail the total and component-wise volume-averaged budget equations of TKE with the simulation data. This budget analysis reveals several mechanisms through which the particles modulate local and global TKE in the particle-laden turbulent channel flow.

Coherent structures in the turbulent channel flow of an elastoviscoplastic fluid

2020 ◽  
Vol 888 ◽  
Author(s):  
S. Le Clainche ◽  
D. Izbassarov ◽  
M. Rosti ◽  
L. Brandt ◽  
O. Tammisola
Keyword(s):  
Channel Flow ◽  
Coherent Structures ◽  
Turbulent Channel Flow ◽  
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scholarly journals Life and death by boundary conditions

2015 ◽  
Vol 768 ◽  
pp. 1-4 ◽  
Author(s):  
Andrea Prosperetti
Keyword(s):  
Boundary Conditions ◽  
Numerical Simulations ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Spherical Particles ◽  
Life And Death

Picano et al. (J. Fluid Mech., vol. 764, 2015, pp. 463–487) have conducted fully resolved numerical simulations of many thousands of spherical particles in a turbulent channel flow with $\mathit{Re}=5600$. Their results give a tantalizing demonstration of the vastness of the vistas that this line of research is about to open.

A heat transfer model of fully developed turbulent channel flow

2019 ◽  
Vol 884 ◽  
Author(s):  
Alireza Ebadi ◽  
Juan Carlos Cuevas Bautista ◽  
Christopher M. White ◽  
Gregory Chini ◽  
Joseph Klewicki
Keyword(s):  
Heat Transfer ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
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