Coherent structures associated with interscale energy transfer in turbulent channel flows

2021 ◽  
Vol 6 (10) ◽  
Author(s):  
Hongping Wang ◽  
Zixuan Yang ◽  
Ting Wu ◽  
Shizhao Wang
Keyword(s):  
Energy Transfer ◽  
Coherent Structures ◽  
Channel Flows ◽  
Turbulent Channel Flows

Interactions of Flow Structure With Nano- and Micro-Particles in Turbulent Channel Flows

2018 ◽  
Author(s):  
Amir A. Mofakham ◽  
Goodarz Ahmadi ◽  
John McLaughlin
Keyword(s):  
Relaxation Time ◽  
Coherent Structures ◽  
Concentration Distribution ◽  
Channel Flows ◽  
Small Scale ◽  
Turbulence Structure ◽  
Micro Particles ◽  
Turbulent Channel Flows ◽  
Wide Range ◽  
Near Wall

This study is concerned with the effects of the flow structures including the near-wall coherent eddies in turbulent channel flows on the dispersion and deposition of nano- and micro-particles. A pseudo-spectral computational code was used for direct numerical simulations (DNS) of the Navier-Stokes equations and the corresponding time histories of the instantaneous fluid velocities were evaluated. Under the oneway coupling assumption, the trajectories of a wide range of particle sizes from 10 nm to 80 μm with dimensionless relaxation time of 2.2e−6 to 142 were obtained by solving the particle equation of motion including Stokes drag and Brownian excitations. Dispersion and deposition of particles in the turbulent flow were evaluated and the effects of turbulence structure on different size particles were studied. The simulation results showed that the concentration distribution of small particles that behave like fluid tracer particles were quite random. However, the preferential concentrations appeared as the dimensionless relaxation time increased to 2–20. In particular, the influence of coherent structures in the near-wall regions was clearly detectable on the concentration distribution of particles, as well as, in their deposition pattern. For τ+ = 20 particles due to the increase of relaxation time and inertia of particles, the small-scale turbulent features were filtered out and only the effect of large-scale turbulent eddies could be identified. For τ+ = 2–20 particles, the ensemble/time average of the position of the deposited particles showed specific spacing which was comparable to the size of the near-wall coherent structures.

scholarly journals Energy transfer in turbulent channel flows and implications for resolvent modelling

2021 ◽  
Vol 911 ◽  
Author(s):  
Sean Symon ◽  
Simon J. Illingworth ◽  
Ivan Marusic
Keyword(s):  
Energy Transfer ◽  
Channel Flows ◽  
Turbulent Channel Flows

Abstract

PARTICLE THERMOPHORETIC DEPOSITION IN TURBULENT CHANNEL FLOWS

2001 ◽  
Vol 32 ◽  
pp. 1033-1034
Author(s):  
A. PINELLI ◽  
E. HONTAÑON ◽  
P. GARCIA-YBARRA
Keyword(s):  
Channel Flows ◽  
Turbulent Channel Flows

scholarly journals The effect of droplet coalescence on drag in turbulent channel flows

2021 ◽  
Vol 33 (8) ◽  
pp. 085112
Author(s):  
Ianto Cannon ◽  
Daulet Izbassarov ◽  
Outi Tammisola ◽  
Luca Brandt ◽  
Marco E. Rosti
Keyword(s):  
Channel Flows ◽  
Droplet Coalescence ◽  
Turbulent Channel Flows

scholarly journals Mitigation of turbophoresis in particle-laden turbulent channel flows by using incident electric fields

2019 ◽  
Vol 4 (12) ◽  
Author(s):  
M. Di Renzo ◽  
P. L. Johnson ◽  
M. Bassenne ◽  
L. Villafañe ◽  
J. Urzay
Keyword(s):  
Electric Fields ◽  
Channel Flows ◽  
Turbulent Channel Flows
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