A preliminary experimental study on the mechanism of local scour at pile groups in steady currents

2015 ◽  
pp. 599-604 ◽  
Author(s):  
F Liang ◽  
C Wang ◽  
Y Wang ◽  
M Huang
Keyword(s):  
Experimental Study ◽  
Local Scour ◽  
Pile Groups

scholarly journals Numerical Simulation of Local Scour around Three Cylindrical Piles in a Tandem Arrangement

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3623
Author(s):  
Jyh-Haw Tang ◽  
Aisyah Dwi Puspasari
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Numerical Model ◽  
Experimental Studies ◽  
Horseshoe Vortex ◽  
Local Scour ◽  
Scour Depth ◽  
Pile Groups ◽  
Tandem Arrangement ◽  
Flow Acceleration

Scouring is one of the most common potential causes of bridge pile foundation failure, with loss of life, economic and environmental impacts. Comprehensive studies on the numerical simulation of local scour around pile groups are still limited. This paper presents a numerical simulation using Flow-3D software to calculate the maximum sediment scour depth and investigate the mechanism around the groups of three cylinders in a tandem arrangement. A validation using the experimental study was carried out to confirm the reliability of the present numerical model. By using the Van Rijn transport rate equation and RNG k-ε turbulence model, the results of time evolution of scour depth and bed elevation contour show good agreement with the experimental study. The numerical simulation of three cylinders in a tandem arrangement were conducted with pile spacing ratios, G/D of 2 and 3. The local scour is affected by the horseshoe vortex from the downflow driven by the downward pressure gradient and rotates in front of the pile and the high bed shear stress, triggered by flow acceleration. The deepest maximum local scour depth is always obtained by the front pile as a shield pile, followed by the piles behind. The trend of the maximum local scour depth in a tandem arrangement is in accordance with the experimental studies and has a better agreement than previous numerical studies with the same model setup. This means that the numerical model used to simulate pile groups is accurate and capable of calculating the depth of sediment scour.

scholarly journals Experimental Study on Local Scour in the Downstream Area of Low Drop Structure Types

Engineering ◽  
2012 ◽  
Vol 04 (08) ◽  
pp. 459-466
Author(s):  
Changsung Kim ◽  
Joongu Kang ◽  
Hongkoo Yeo
Keyword(s):  
Experimental Study ◽  
Local Scour ◽  
Drop Structure ◽  
Downstream Area

Experimental study on local scour at complex bridge pier under combined waves and current

2020 ◽  
Vol 160 ◽  
pp. 103730
Author(s):  
Yifan Yang ◽  
Bruce W. Melville ◽  
Graham H. Macky ◽  
Asaad Y. Shamseldin
Keyword(s):  
Experimental Study ◽  
Local Scour ◽  
Bridge Pier

An experimental study of local Scour around V‐deflector over fine‐grained bed

2007 ◽  
Vol 32 (sup1) ◽  
pp. 786-797
Author(s):  
Daeyoung Yu ◽  
Sung‐Uk Choi ◽  
Hyoseop Woo
Keyword(s):  
Experimental Study ◽  
Local Scour ◽  
Fine Grained
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