scholarly journals Numerical Study of Turbulent Flow Structure in Curved Open-Channel Flow with Flood Plains

1998 ◽  
Vol 1 ◽  
pp. 683-692
Author(s):  
Hitoshi SUGIYAMA ◽  
Mitsunobu AKIYAMA ◽  
Mieko TANAKA
Keyword(s):  
Turbulent Flow ◽  
Flow Structure ◽  
Channel Flow ◽  
Open Channel ◽  
Numerical Study ◽  
Open Channel Flow ◽  
Flood Plains ◽  
Turbulent Flow Structure

scholarly journals Turbulent flow structure at a 90-degree open channel confluence: Accounting for the distortion of the shear layer

2016 ◽  
Vol 12 ◽  
pp. 130-147 ◽  
Author(s):  
Saiyu Yuan ◽  
Hongwu Tang ◽  
Yang Xiao ◽  
Xuehan Qiu ◽  
Huiming Zhang ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Shear Layer ◽  
Flow Structure ◽  
Open Channel ◽  
Turbulent Flow Structure ◽  
Channel Confluence

On the interaction between a turbulent open channel flow and an axial-flow turbine

2013 ◽  
Vol 716 ◽  
pp. 658-670 ◽  
Author(s):  
L. P. Chamorro ◽  
C. Hill ◽  
S. Morton ◽  
C. Ellis ◽  
R. E. A. Arndt ◽  
...  
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Axial Flow ◽  
Open Channel Flow ◽  
Angular Frequency ◽  
High Temporal Resolution ◽  
Wake Region ◽  
Low Frequencies ◽  
Turbulent Flow Structure ◽  
Torque Transducer

AbstractA laboratory experiment was performed to study the dynamically rich interaction of a turbulent open channel flow with a bed-mounted axial-flow hydrokinetic turbine. An acoustic Doppler velocimeter and a torque transducer were used to simultaneously measure at high temporal resolution the three velocity components of the flow at various locations upstream of the turbine and in the wake region and turbine power, respectively. Results show that for sufficiently low frequencies the instantaneous power generated by the turbine is modulated by the turbulent structure of the approach flow. The critical frequency above which the response of the turbine is decoupled from the turbulent flow structure is shown to vary linearly with the angular frequency of the rotor. The measurements elucidate the structure of the turbulent turbine wake, which is shown to persist for at least fifteen rotor diameters downstream of the rotor, and a new approach is proposed to quantify the wake recovery, based on the growth of the largest scale motions in the flow. Spectral analysis is employed to demonstrate the dominant effect of the tip vortices in the energy distribution in the near-wake region and uncover meandering motions.

New designs for vertical slot fishways

1992 ◽  
Vol 19 (3) ◽  
pp. 402-414 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Solanki
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Slot Width ◽  
Satisfactory Performance ◽  
Vertical Slot ◽  
Hydraulic Design

This paper presents the results of an experimental study on 18 designs of vertical slot fishways. Based on these results, it appears that a width of 8b0 and a length of 10b0 for the pools, where b0 is the slot width, are satisfactory, and minor variations can be made to these dimensions without affecting their satisfactory performance. In the two general groups of designs, design 6 in the first group and designs 16 and 18 in the second group are recommended for practical use. Key words: fishways, hydraulics, turbulent flow, open-channel flow, hydraulic design.

Hydraulics of offset baffle culvert fishways

1988 ◽  
Vol 15 (6) ◽  
pp. 1043-1051 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Lodewyk
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Equation

This paper presents the results of an experimental study on the hydraulics of culverts with offset baffles to pass fish. Using analytical considerations and experimental observations, a flow equation has been developed between the discharge, diameter, depth, and slope for a culvert fish way with the standard offset baffle system. The velocity field at the slot has also been evaluated. Some further experiments were performed to assess the effect of baffle spacing and height on the hydraulics of the culvert fishway. Key words: culverts, fishways, baffles, hydraulics, open-channel flow, turbulent flow.

scholarly journals The Numerical Study of Turbulent Structure in Curved Open-Channel Flow.

1997 ◽  
pp. 11-21
Author(s):  
Hitoshi Sugiyama ◽  
Mitsunobu Akiyama ◽  
Masayuki Kamezawa
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Numerical Study ◽  
Open Channel Flow ◽  
Turbulent Structure
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