每年出版 6 期
ISSN 打印: 2152-5102
ISSN 在线: 2152-5110
Indexed in
Kinematics of Horseshoe Vortex in a Scour Hole around Two Eccentric Triangular Piers
摘要
Flow pattern at single pier has been extensively studied by many investigators, but very little work is available on turbulent flow pattern around piers placed in close proximity. The work explained in this research is concerned with experimental study of the horseshoe vortex flow pattern and characteristics in a local equilibrium scour around a set of two equilateral triangular piers (sides facing the approaching flow) placed in longitudinal direction to the flow with an eccentricity (transverse distance). The eccentricity and longitudinal spacing (spacing along the flow) between two piers were kept constant. Instantaneous three-dimensional velocities were determined by using an acoustic Doppler velocimeter. The contours and distributions of the time-averaged velocity components, turbulence intensities and turbulence kinetic energy are illustrated at different azimuthal planes: 0, 45, −45, 90 and −90°. Velocity vectors presented from time-averaged velocity fields are used to show further flow features. The vorticity and circulation of the horseshoe vortex are computed by using forward difference technique of computational hydrodynamics and Stokes theorem, respectively. The pier arrangement and the interference between the horseshoe vortex of the rear pier and wake vortex of the front pier play a significant role in the creation and formation of the greater scour depth at the eccentric rear piers. Due to the existence of bluff body, the pressure drag becomes much higher than the skin friction drag. This phenomenon was examined during this testing. Vortex strength of the eccentric rear pier was observed always higher in the inline front pier.
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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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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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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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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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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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Roy Priyanka, Das Subhasish, Dey Anupama, Das Rajib, Analytical Study of Scour Mechanism Around Immersed Rectangular Vane Structures, in Advanced Modelling and Innovations in Water Resources Engineering, 176, 2022. Crossref