Study on aerodynamics of an inclined circular cylinder in a span-wise linear shear flow

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (21) : 31-37.

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Study on aerodynamics of an inclined circular cylinder in a span-wise linear shear flow

DU Xiao-qing，Fei Chen-jie，Kuan Zhong-hua，Zhao Yan

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Abstract

Aerodynamic characteristics of an inclined circular cylinder in a span-wise shear flow were investigated using Large Eddy Simulation (LES). The effects of the shear flow on the pressure distributions, Strouhal number, time history and power spectral density (PSD) of aerodynamic forces, and span-wise correlation of wind forces of the inclined cylinder were discussed. Furthermore, the possible mechanism of the influence of the shear flow on the cylinder was proposed. Under the condition of a uniform incoming flow, present computations confirmed the existence of the axial flow behind the inclined cylinder as well as a decreased Karman vortex shedding caused by the axial flow. However, when the incoming flow involved span-wise linear non-uniformity, it was found that the intensity of the axial flow decreased and even suppressed if the intensity of the shear flow was high enough. Furthermore, the shear flow caused the recovery of the intense Karman vortex behind the inclined cylinder and had substantial effects on the aerodynamic characteristics of the cylinder.

Key words

Inclined circular cylinder / span-wise shear flow / axial flow / Karman vortex / aerodynamic characteristic

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DU Xiao-qing;Fei Chen-jie;Kuan Zhong-hua;Zhao Yan. Study on aerodynamics of an inclined circular cylinder in a span-wise linear shear flow[J]. Journal of Vibration and Shock, 2014, 33(21): 31-37