Abstract
In order to study the characteristics of flow around a side abutment, two model experiments of flow around rectangular and semicircular cross-section cylinder were conducted respectively, and an acoustic doppler velocimeter(ADV) was used to measure the instantaneous three-dimensional velocity components at vertical sections of two kinds of flow around the cylinder. Moreover, velocity vector, absolute velocity and turbulent kinetic energy were analyzed respectively at different vertical sections. The results reveal that: under the same conditions of upstream coming flow, the turbulence of the flow around a rectangular cross-section cylinder is strong ,and the maximum velocity are generated in the middle reaches of the cylinder near the side wall, The value of turbulent kinetic energy in the mainstream area is nearly zero. The flow around a semicircular cross-section cylinder is smooth, recirculation in the downstream is small, and the turbulence is weak.
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