Numerical Investigation on Wake Flow Structure and Hydrodynamic Characteristics of Flow Around C-shaped Cylinder
In this paper,a numerical investigation is conducted on the flow over a C-shaped cylinder in the low Reynolds number(Re=40-160)and the effect of attack angle(α)ranging from 0° to 180° is examined simultaneously.The wake evolution,vortex structure as well as the hydrodynamic characteristics are discussed.The results show that the near-wall wake structure is closely associated with Re and α.Night flow patterns are identified based on the location of boundary layer separation points and the evolution of near-wall vortices,including Pattern Ⅰ,Pattern Ⅱ-1,Pattern Ⅱ-2,Pattern Ⅲ-1,Pattern Ⅲ-2,Pattern Ⅳ,Pattern V,PatternⅥ,Pattern Ⅶ.Additionally,the characteristic parameters are related to the flow pattern partition.When quasi-static(QS)vortexes occur,the length of vortexes formation and the length of recirculation bubbles are enlarged,while the wake width is relatively small.The maximum mean drag coefficient occurs in the region of Pattern Ⅰ,and the maximum root-mean-square lift coefficient is observed in the region of Pattern Ⅱ-2.The far-field vortex shedding mode is mainly the 2S vortex mode,and no vortex shedding is found in the low Reynolds number cases.The P+S vortex mode and secondary vortex street occur when Re=60 and α=150°.
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