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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN 印刷: 2152-5102
ISSN オンライン: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v41.i4.20
pages 296-317

Kinematics of Horseshoe Vortex in a Scour Hole around Two Eccentric Triangular Piers

Subhasish Das
School of Water Resources Engineering, Jadavpur University, Kolkata, West Bengal, India
Sudipta Ghosh
School of Water Resources Engineering, Jadavpur University, Kolkata, West Bengal, India
Asis Mazumdar
School of Water Resources Engineering, Jadavpur University, Kolkata 700032, India

要約

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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