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Research Article Open access CC BY 3.0

Effect of Jet Injection on Flow Structure in Local Pier Scour

Somayeh Soltani-Gerdefaramarzi, Hossein Afzalimehr, Yee-Meng Chiew, Jacques Gallichand

Current Journal of Applied Science and Technology · pp. 477–491 · Published 7 Nov 2013

10.9734/BJAST/2014/6400

Abstract

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.  

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

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Cited by 5

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Theoretical and experimental study of scour depth by submerged water jet

Jiaoyi Hou, Lishan Zhang, Yongjun Gong · Advances in Mechanical Engineering · 2016

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