scholarly journals Detection Criterion of Coherent Structures in Turbulent Open-channel Flow

1981 ◽  
Vol 25 ◽  
pp. 439-445
Keyword(s):  
Channel Flow ◽  
Coherent Structures ◽  
Open Channel ◽  
Open Channel Flow ◽  
Detection Criterion

scholarly journals Large-Eddy Simulation of Open-Channel Flow with Rigid Submerged Vegetation

10.29007/v24t ◽  
2018 ◽  
Author(s):  
Alessandro Monti ◽  
Mohammad Omidyeganeh ◽  
Alfredo Pinelli
Keyword(s):  
Large Eddy Simulation ◽  
Channel Flow ◽  
Coherent Structures ◽  
Open Channel ◽  
Open Channel Flow ◽  
Strong Impact ◽  
Streamwise Direction ◽  
Eddy Simulation ◽  
Large Structures ◽  
Large Eddy

A large-eddy simulation over a fully submerged, rigid canopy in an open-channel flow under transitional canopy flow regime has been carried out. The simulations revealed a flow structure characterized by the emergence of coherent structures, which are very elongated in the streamwise direction occupying a large portion of the flow inside and outside the canopy. These very large structures have a strong impact on the flow inside the canopy as well.

scholarly journals STEREO PIV MEASUREMENT OF NEAR-WALL COHERENT STRUCTURES IN OPEN-CHANNEL FLOW

2002 ◽  
Vol 46 ◽  
pp. 523-528
Author(s):  
John C. WELLS ◽  
Keiji Kishida
Keyword(s):  
Channel Flow ◽  
Coherent Structures ◽  
Open Channel ◽  
Open Channel Flow ◽  
Piv Measurement ◽  
Near Wall

scholarly journals Time-averaged Image of Coherent Structures in Turbulent Open Channel Flow

1990 ◽  
Vol 34 ◽  
pp. 457-462
Author(s):  
Takanori SAGA ◽  
Hirofumi OHNARI ◽  
Katutoshi WATANABE ◽  
Takashi SAITOU
Keyword(s):  
Channel Flow ◽  
Coherent Structures ◽  
Open Channel ◽  
Open Channel Flow

scholarly journals Wavelet Coherency Structure in Open Channel Flow

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1664 ◽  
Author(s):  
Kebing Chen ◽  
Yifan Zhang ◽  
Qiang Zhong
Keyword(s):  
Channel Flow ◽  
Coherent Structures ◽  
Open Channel ◽  
Velocity Structure ◽  
Single Point ◽  
Measurement Data ◽  
Open Channel Flow ◽  
Wavelet Spectrum ◽  
Time Resolved ◽  
Wavelet Coherency

Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in x–y plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3h motions. The wavelet coherent coefficients of u and v series from the same measurement points successfully detected the occurrence and the scale of these 3h motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3h scale motions. All the features of this 3h motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets.

NEAR-WALL COHERENT STRUCTURES IN OPEN-CHANNEL FLOW: TIME-RESOLVED STEREO PIV MEASUREMENTS IN THE CROSS-STREAM PLANE

2002 ◽  
Author(s):  
KEIJI KISHIDA ◽  
JOHN C. WELLS ◽  
NORIYUKI UKAI ◽  
YASUTAKA HIMENO ◽  
YASUFUMI YAMAMOTO
Keyword(s):  
Channel Flow ◽  
Coherent Structures ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Time ◽  
Time Resolved ◽  
Piv Measurements ◽  
The Cross ◽  
Near Wall
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