Turbulence Modification Due to Wave Action at Low Reynolds Numbers in Horizontal Open-Channel Flow

2001 ◽  
Vol 134 (1) ◽  
pp. 84-96 ◽  
Author(s):  
Evangelos Stamatiou ◽  
Peter M.-Y. Chung ◽  
Masahiro Kawaji
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Reynolds Numbers ◽  
Wave Action ◽  
Low Reynolds Numbers ◽  
Turbulence Modification ◽  
Low Reynolds

Open-Channel Flow at Small Reynolds Numbers

1958 ◽  
Vol 123 (1) ◽  
pp. 685-706
Author(s):  
Lorenz G. Straub ◽  
Edward Silberman ◽  
Herbert C. Nelson
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Reynolds Numbers ◽  
Small Reynolds Numbers

scholarly journals Kinematics and Dynamics of Turbulent Bands at Low Reynolds Numbers in Channel Flow

Entropy ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1167 ◽  
Author(s):  
Xiangkai Xiao ◽  
Baofang Song
Keyword(s):  
Channel Flow ◽  
Tilt Angle ◽  
Propagation Speed ◽  
Reynolds Numbers ◽  
Point Of View ◽  
Kinematics And Dynamics ◽  
Low Reynolds Numbers ◽  
Low Reynolds ◽  
Low Speed Streaks ◽  
Large Flow

Channel flow turbulence exhibits interesting spatiotemporal complexities at transitional Reynolds numbers. In this paper, we investigated some aspects of the kinematics and dynamics of fully localized turbulent bands in large flow domains. We discussed the recent advancement in the understanding of the wave-generation at the downstream end of fully localized bands. Based on the discussion, we proposed a possible mechanism for the tilt direction selection. We measured the propagation speed of the downstream end and the advection speed of the low-speed streaks in the bulk of turbulent bands at various Reynolds numbers. Instead of measuring the tilt angle by treating an entire band as a tilted object as in prior studies, we proposed that, from the point of view of the formation and growth of turbulent bands, the tilt angle should be determined by the relative speed between the downstream end and the streaks in the bulk. We obtained a good agreement between our calculation of the tilt angle and the reported results in the literature at relatively low Reynolds numbers.

The undular hydraulic jump in turbulent open channel flow at large Reynolds numbers

2003 ◽  
Vol 15 (3) ◽  
pp. 730-735 ◽  
Author(s):  
Wolfgang Grillhofer ◽  
Wilhelm Schneider
Keyword(s):  
Channel Flow ◽  
Hydraulic Jump ◽  
Open Channel ◽  
Open Channel Flow ◽  
Reynolds Numbers

On the Anisotropic Vorticity in Turbulent Channel Flows

2015 ◽  
Vol 137 (8) ◽  
Author(s):  
Helge I. Andersson ◽  
Lihao Zhao ◽  
Evan A. Variano
Keyword(s):  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Reynolds Numbers ◽  
Channel Flows ◽  
Vorticity Field ◽  
Particle Suspensions ◽  
Low Reynolds Numbers ◽  
Turbulent Channel Flows ◽  
Low Reynolds

Revisiting the fluctuating vorticity field in the centerplane of a turbulent channel flow, we show that the vorticity is distinctly anisotropic at low Reynolds numbers (Re). This result is in contrast with some earlier conclusions. The anisotropy is a function of Re, and we have compiled data to show that the anisotropy gradually vanishes with increasing Re. Acknowledging the anisotropy is important for current efforts on simulating turbulent particle suspensions.

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