Large eddy simulation of inertial fiber deposition mechanisms in a vertical downward turbulent channel flow
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DOI: 10.1002/aic.15664
Abstract: The deposition pattern of elongated inertial fibers in a vertical downward turbulent channel flow is predicted using large eddy simulation and Lagrangian particle tracking. Three dominant fibers deposition mechanisms are observed, namely, diffusional deposition for… read more here.
Keywords: vertical downward; turbulent channel; deposition; fiber ... See more keywords
Turbulent kinetic energy estimate in the near wall region of smooth turbulent channel flows
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DOI: 10.1007/s11012-021-01396-2
Abstract: Turbulent kinetic energy (TKE) equation based on the Reynolds averaging hypothesis was approximated in the near wall region of turbulent channel flows and an analytical solution for TKE was proposed by Absi for $$y^{ +… read more here.
Keywords: kinetic energy; turbulent channel; turbulent kinetic; near wall ... See more keywords
Turbulent channel flow perturbed by triangular ripples
Sign Up to like & getrecommendations! Published in 2018 at "Journal of The Brazilian Society of Mechanical Sciences and Engineering"
DOI: 10.1007/s40430-018-1050-7
Abstract: This paper presents an experimental investigation of the perturbation of a turbulent closed-conduit flow by two-dimensional triangular ripples. Two ripple configurations were employed: one single asymmetric triangular ripple, and two consecutive asymmetric triangular ripples, all… read more here.
Keywords: ripple; turbulent channel; triangular ripples; channel flow ... See more keywords
Turbulent channel flow over riblets with superhydrophobic coating
Sign Up to like & getrecommendations! Published in 2018 at "Experimental Thermal and Fluid Science"
DOI: 10.1016/j.expthermflusci.2018.02.001
Abstract: Abstract The performance of riblet surfaces after applying a superhydrophobic coating (SHC) is evaluated by planar particle image velocimetry (PIV) measurement at riblet tip spacing of s+ = 8.6, 17.3, and 34.6 (normalized using wall unit). The… read more here.
Keywords: turbulent channel; channel flow; superhydrophobic coating; riblet ... See more keywords
Estimation of turbulent channel flow at $Re_{\unicode[STIX]{x1D70F}}~=~100$ based on the wall measurement using a simple sequential approach
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2017.580
Abstract: The unsteady flow estimation problem of wall-bounded turbulence, numerically benchmarked by Chevalier et al. (J. Fluid Mech., vol. 552, 2006, pp. 167–187), is re-tackled with simple approaches. A turbulent channel flow at $Re_{\unicode[STIX]{x1D70F}}=100$ with periodic… read more here.
Keywords: estimation; turbulent channel; wall; channel flow ... See more keywords
Passive scalar transport in rotating turbulent channel flow
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2018.198
Abstract: Passive scalar transport in turbulent channel flow subject to spanwise system rotation is studied by direct numerical simulations. The Reynolds number $Re=U_{b}h/\unicode[STIX]{x1D708}$ is fixed at 20 000 and the rotation number $Ro=2\unicode[STIX]{x1D6FA}h/U_{b}$ is varied from 0… read more here.
Keywords: turbulent channel; transport; scalar transport; rotation ... See more keywords
Reconsideration of spanwise rotating turbulent channel flows via resolvent analysis
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DOI: 10.1017/jfm.2018.894
Abstract: We study the effect of spanwise rotation in turbulent channel flow at both low and high Reynolds numbers by employing the resolvent formulation proposed by McKeon & Sharma (J. Fluid Mech., vol. 658, 2010, pp.… read more here.
Keywords: turbulent channel; analysis; rotation; across spectral ... See more keywords
Interface-resolved simulations of small inertial particles in turbulent channel flow
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DOI: 10.1017/jfm.2019.918
Abstract: We present a direct comparison between interface-resolved and one-way-coupled point-particle direct numerical simulations (DNS) of gravity-free turbulent channel flow laden with small inertial particles, with high particle-to-fluid density ratio and diameter of approximately three viscous… read more here.
Keywords: interface resolved; turbulent channel; inertial particles; small inertial ... See more keywords
Machine-learning-based feedback control for drag reduction in a turbulent channel flow
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DOI: 10.1017/jfm.2020.690
Abstract: Abstract One of the successful feedback controls for skin-friction drag reduction designed by Choi et al. (J. Fluid Mech., vol. 262, 1994, pp. 75–110), called ‘opposition control’, has a limitation in application because the sensors… read more here.
Keywords: turbulent channel; wall normal; wall; channel flow ... See more keywords
The colour of forcing statistics in resolvent analyses of turbulent channel flows
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DOI: 10.1017/jfm.2020.802
Abstract: Abstract In resolvent analyses of turbulent channel flows it has been common practice to neglect or model the nonlinear forcing term that forms the input of the resolvent. However, the spatiotemporal structure of this term… read more here.
Keywords: channel flows; turbulent channel; channel; nonlinear forcing ... See more keywords
Reducing spin-up time for simulations of turbulent channel flow
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DOI: 10.1063/1.4993489
Abstract: Spin-up of turbulent channel flow forced with a constant mean pressure gradient is prolonged because the flow accelerates due to an imbalance between the driving pressure gradient and total bottom stress. To this end, a… read more here.
Keywords: turbulent channel; velocity; pressure gradient; spin time ... See more keywords