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British Journal of Applied Science & Technology, ISSN: 2231-0843,Vol.: 4, Issue.: 3 (21-31 January)


Effect of Jet Injection on Flow Structure in Local Pier Scour


Somayeh Soltani-Gerdefaramarzi1*, Hossein Afzalimehr2, Yee-Meng Chiew3 and Jacques Gallichand4

1Department of Agricalture and Natural Resources Engineering, Ardakan University, Iran.
2Department of Water Engineering, Isfahan University of Technology, Iran.
3School of Civil and Environmental Engineering, Nanyang Technological University, Singapore.
4Département Des Sols et de Génie Agroalimentaire, Université Laval, St-Foy, QC, Canada.

Article Information


(1) Abida Farooqi, Department of Environmental Sciences, Quiad-i-Azam University, Pakistan.


(1) Anonymous

(2) Anonymous

Complete Peer review History: http://www.sciencedomain.org/review-history/2438


This study investigates experimentally the effect of jet injection on the flow structure around a pier-scour hole. Experiments are conducted with 1-jet, 3-jets and without jet injection under clear-water scour conditions. The results show that the jet(s) alter(s) the turbulent characteristics and vertical component of the velocity, causing a reduction of the strength of the down flow. A quadrant analysis for the Reynolds shear stress values reveals that the sweeps and ejections have the main contributions on the Reynolds shear stress production in the near-bed flow. The third-order correlations of velocity fluctuations show an obvious distinction for the jet injection experiments in comparison to that without injections, especially inside the scour hole.

Keywords :

Jet injection; pier scour; quadrant analysis; Reynolds shear stress; third-order correlations.

Full Article - PDF    Page 477-491

DOI : 10.9734/BJAST/2014/6400

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