Characterization of Flow Turbulence Around Bridge Pier on Rigid Bed Channel

2021 ◽  
pp. 277-287
Author(s):  
Pasupuleti Laxmi Narayana ◽  
Praful Vasharambhai Timbadiya ◽  
Prem Lal Patel
Keyword(s):  
Bridge Pier ◽  
Flow Turbulence

Randomness in flow turbulence around a bridge pier in a sand mined channel

2019 ◽  
Vol 535 ◽  
pp. 122426
Author(s):  
Abhijit D. Lade ◽  
Anja Mihailović ◽  
Dragutin T. Mihailović ◽  
Bimlesh Kumar
Keyword(s):  
Bridge Pier ◽  
Flow Turbulence

Study of flow turbulence around a circular bridge pier in sand-mined stream channel

2020 ◽  
Vol 173 (5) ◽  
pp. 217-237
Author(s):  
Abhijit D. Lade ◽  
Vishal Deshpande ◽  
Bimlesh Kumar
Keyword(s):  
Bridge Pier ◽  
Stream Channel ◽  
Flow Turbulence

Characterization of flow turbulence in mobile boundary channels

2015 ◽  
Vol 21 (2) ◽  
pp. 179-192 ◽  
Author(s):  
Sudhanshu Dixit ◽  
P.L. Patel
Keyword(s):  
Flow Turbulence ◽  
Mobile Boundary

scholarly journals Experimental Characterization of the Flow Field around Oblong Bridge Piers

Fluids ◽  
2021 ◽  
Vol 6 (11) ◽  
pp. 370
Author(s):  
Ana Margarida Bento ◽  
Teresa Viseu ◽  
João Pedro Pêgo ◽  
Lúcia Couto
Keyword(s):  
Flow Field ◽  
Large Scale ◽  
Bridge Pier ◽  
Bridge Piers ◽  
Shear Stresses ◽  
Velocity Measurements ◽  
Bridge Foundations ◽  
Scour Hole ◽  
Movable Bed

The prediction of scour evolution at bridge foundations is of utmost importance for engineering design and infrastructures’ safety. The complexity of the scouring inherent flow field is the result of separation and generation of multiple vortices and further magnified due to the dynamic interaction between the flow and the movable bed throughout the development of a scour hole. In experimental environments, the current approaches for scour characterization rely mainly on measurements of the evolution of movable beds rather than on flow field characterization. This paper investigates the turbulent flow field around oblong bridge pier models in a well-controlled laboratory environment, for understanding the mechanisms of flow responsible for current-induced scour. This study was based on an experimental campaign planned for velocity measurements of the flow around oblong bridge pier models, of different widths, carried out in a large-scale tilting flume. Measurements of stream-wise, cross-wise and vertical velocity distributions, as well as of the Reynolds shear stresses, were performed at both the flat and eroded bed stages of scouring development with a high-resolution acoustic velocimeter. The time-averaged values of velocity and shear stress are larger in the presence of a developed scour hole than in the corresponding flat bed configuration.

Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier

2019 ◽  
Vol 34 (2) ◽  
pp. 118-124 ◽  
Author(s):  
Dawei Guan ◽  
Yee-Meng Chiew ◽  
Maoxing Wei ◽  
Shih-Chun Hsieh
Keyword(s):  
Horseshoe Vortex ◽  
Bridge Pier ◽  
Scour Hole

scholarly journals Characterization of the scour cavity evolution around a complex bridge pier

2015 ◽  
Vol 4 (2) ◽  
pp. 128-137 ◽  
Author(s):  
Pedro Xavier Ramos ◽  
Ana Margarida Bento ◽  
Rodrigo Maia ◽  
João Pedro Pêgo
Keyword(s):  
Bridge Pier ◽  
Cavity Evolution

Characterization of flow turbulence in large-scale bubble-plume experiments

2006 ◽  
Vol 41 (1) ◽  
pp. 91-101 ◽  
Author(s):  
Carlos M. García ◽  
Marcelo H. García
Keyword(s):  
Large Scale ◽  
Bubble Plume ◽  
Flow Turbulence

Characterization of Blood Flow Turbulence With Pulsed-Wave and Power Doppler Ultrasound Imaging

1996 ◽  
Vol 118 (3) ◽  
pp. 318-325 ◽  
Author(s):  
Guy Cloutier ◽  
Louis Allard ◽  
Louis-Gilles Durand
Keyword(s):  
Blood Flow ◽  
Shear Layer ◽  
Velocity Fluctuation ◽  
Power Doppler ◽  
Spectral Broadening ◽  
Recirculation Zones ◽  
Flow Turbulence ◽  
Doppler Power ◽  
Hot Film

Blood flow turbulence downstream of a concentric 86 percent area reduction stenosis was characterized using absolute and relative Doppler spectral broadening measurements, relative Doppler velocity fluctuation, and Doppler backscattered power. Bidi-mensional mappings of each Doppler index were obtained using a 10 MHz pulsed-wave Doppler system. Calf red cells suspended in a saline solution were used to scatter ultrasound and were circulated in an in vitro steady flow loop model. Results showed that the absolute spectral broadening was not a good index of turbulence because it was strongly affected by the deceleration of the jet and by the shear layer between the jet and the recirculation zones. Relative Doppler spectral broadening (absolute broadening divided by the frequency shift), velocity fluctuation, and Doppler power indices provided consistent mapping of the centerline axial variation of turbulence evaluated by hot-film anemometry. The best agreement between the hot-film and Doppler ultrasound methods was however obtained with the Doppler back-scattered power. The most consistent bidimensional mapping of the flow characteristics downstream of the stenosis was also observed with the Doppler power index. The relative broadening and the velocity fluctuation produced artifacts in the shear layer and in the recirculation zones. Power Doppler imaging is a new emerging technique that may provide reliable in vivo characterization of blood flow turbulence.

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