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ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110
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A Study of Wake Vortex in the Scour Region around a Circular Pier
Краткое описание
Wake vortex scour is very important when successive piers (one downstream of other) are kept. In case of successive pier arrangement, the wake vortex of the upstream pier may influence the horseshoe vortex of the pier placed downstream. If the piers are arranged eccentrically then the sediment movement may take place towards the side wall of the flume as well as along the downstream. For this reason the study of turbulent flow characteristics of a wake vortex within an equilibrium scour hole is very important. In the present paper the outcome of experimental study on the turbulent wake vortex flow at cylindrical pier measured by an acoustic Doppler velocimeter (ADV) were presented. In this study three different piers were used with diameters 0.10 m, 0.075 m and 0.05 m. Vector plots of the flow field reveal the vorticity and circulation characteristics of the wake vortex flow associated with an upflow at equilibrium scour hole condition. Results show that the non dimensional wake vortex circulation increases at y = 0 and ±3 until Rep value reaches around 2.40·104 but then it decreases with further increase in Rep, as the wake vortices are washed away due to further increase of inertia force. Similar trend was observed when the non-dimensional circulation was presented with respect to different pier diameter as well as at different nondimensional inflow depth. The non-dimensional circulation along the centreline (y = 0) of the flume is lesser than y = ±3 which verifies that the wake vortices get weaker when they come closer to the centreline of flow.
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Pournazeri S., Li S.S., Haghighat F., Efficient non-hydrostatic modelling of flow and bed shear stress in a pier scour hole, Canadian Journal of Civil Engineering, 41, 5, 2014. Crossref
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Das S., Das R., Mazumdar A., Vorticity and Circulation of Horseshoe Vortex in Equilibrium Scour Holes at Different Piers, Journal of The Institution of Engineers (India): Series A, 95, 2, 2014. Crossref
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Das Subhasish, Mazumdar Asis, Turbulence flow field around two eccentric circular piers in scour hole, International Journal of River Basin Management, 13, 3, 2015. Crossref
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Das Subhasish, Das Rajib, Mazumdar Asis, Comparison of Local Scour Characteristics around Two Eccentric Piers of Different Shapes, Arabian Journal for Science and Engineering, 41, 4, 2016. Crossref
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Jaman Hasanur, Das Subhasish, Kuila Asim, Mazumdar Asis, Hydrodynamic Flow Patterns Around Three Inline Eccentrically Arranged Circular Piers, Arabian Journal for Science and Engineering, 42, 9, 2017. Crossref
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Das Subhasish, Mazumdar Asis, Evaluation of Hydrodynamic Consequences for Horseshoe Vortex System Developing Around two Eccentrically Arranged Identical Piers of Diverse Shapes, KSCE Journal of Civil Engineering, 22, 7, 2018. Crossref
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Pandey Manish, Sharma P. K., Ahmad Z., Karna Nilav, Maximum scour depth around bridge pier in gravel bed streams, Natural Hazards, 91, 2, 2018. Crossref
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Jaman Hasanur, Das Subhasish, Das Rajib, Mazumdar Asis, Hydrodynamics of Flow Obstructed by Inline and Eccentrically-Arranged Circular Piers on a Horizontal Bed Surface, Journal of The Institution of Engineers (India): Series A, 98, 1-2, 2017. Crossref
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Vaghefi Mohammad, Motlagh Mohammad Javad Tabib Nazhad, Hashemi Seyyed Shaker, Moradi Sahar, Experimental study of bed topography variations due to placement of a triad series of vertical piers at different positions in a 180° bend, Arabian Journal of Geosciences, 11, 5, 2018. Crossref
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Das Rajib, Das Subhasish, Jaman Hasanur, Mazumdar Asis, Impact of Upstream Bridge Pier on the Scouring Around Adjacent Downstream Bridge Pier, Arabian Journal for Science and Engineering, 44, 5, 2019. Crossref
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Kuila Asim, Das Subhasish, Mazumdar Asis, A Comparative Analysis of Flow Fields around a Composite Hydrokinetic Device, Applied Mechanics and Materials, 897, 2020. Crossref
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Pandey Manish, Zakwan Mohammad, Khan Mohammad Amir, Bhave Swati, Development of scour around a circular pier and its modelling using genetic algorithm, Water Supply, 20, 8, 2020. Crossref
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Kuila A, Mukherjee B, Das S, Comparison of Vortex Induced Velocity Kinematics around Underwater Horizontal Cylinder with Vertical End Plate, IOP Conference Series: Materials Science and Engineering, 1080, 1, 2021. Crossref