<span>Numerical simulation of aerodynamic forces and flow field around a4∶1 rectangular cylinder under streamwise sinusoidal flow</span>

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (9) : 25-36.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Numerical simulation of aerodynamic forces and flow field around a4∶1 rectangular cylinder under streamwise sinusoidal flow

JING Hongmiao1,2,3, XU Haoran3, LI Weikang3, ZHAO Wanru3, CUI Shengnan3, QIAO Mingzhe*4

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Abstract

The flow field pattern around a rectangular cylinder in turbulent flow show discrepancies with those in uniform flow. To further understand the influence of streamwise gust inflow on flow field around a rectangular cylinder, three-dimensional Large-Eddy Simulations (LES) were conducted to investigate the influence of streamwise sinusoidal flow with different frequencies on the aerodynamic forces and flow field characteristics of a 4:1 rectangular cylinder. Changing pattern of some parameters, include lift and drag force coefficient, base suction coefficient, Strouhal number, recirculation length and reattachment length, were analyzed in detail, mean structure and evolution of the flow field around the cylinder in unform flow and sinusoidal flow were also compared. The results indicate that the oncoming flow conditions has a significant effect on the structure of flow field around the rectangular cylinder. In streamwise sinusoidal flow, the dominant frequency of drag coefficient is basically same with the inflow frequency. When , streamwise sinusoidal flow hold a dominant position on the lift force direction, while alternating vortex shedding was strongly suppressed. As the inflow frequency increased, the recirculation length also kept increasing, while the reattachment length increased first and then decreased, reached a maximum value when . The vortices above and below the leading edge of the rectangular cylinder are symmetrically separated in streamwise sinusoidal flow, when the trailing vortex shedding is not synchronized with the leading edge. The trailing edge vortices are alternately shed and broken up into small-scale vortices in the wake.

Key words

streamwise sinusoidal flow / 4:1 rectangular cylinder / Large-Eddy Simulation / aerodynamic characteristics / flow field

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JING Hongmiao1, 2, 3, XU Haoran3, LI Weikang3, ZHAO Wanru3, CUI Shengnan3, QIAO Mingzhe4. Numerical simulation of aerodynamic forces and flow field around a4∶1 rectangular cylinder under streamwise sinusoidal flow[J]. Journal of Vibration and Shock, 2025, 44(9): 25-36

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