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QUASI-STATIC APPROACH OF DAMPING FORCES EXERTED UPON A LONG CYLINDER OSCILLATING IN AN AXIAL FLOW

机译:轴流中长圆柱振动引起阻尼力的准静态方法

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This study investigates the flow around a cylinder in a near-axial flow at a Reynolds number of 27000. Both CFD calculations and experiments are performed. Time-mean values of lift force coefficient are investigated against the inclination of the cylinder in the domain of low inclinations (< 15°). Pressure distribution and flow profiles are also measured and extracted from the CFD calculation results for a characteristic inclination α = 5°. Numerical results for force and pressure show fair agreement with experiments for inclination below 5° and reveal that at low angles, the lift force is proportional to the angle. In the framework of a quasi-static approach, the instantaneous damping force exerted on a cylinder oscillating in axial flow is equivalent to the normal force exerted on a cylinder placed in an oblique flow.
机译:这项研究调查了雷诺数为27000的近轴流中圆柱体周围的流动。同时进行了CFD计算和实验。在低倾角(<15°)范围内,针对缸体的倾角研究了升力系数的时间平均值。对于特征倾角α= 5°,还可以测量压力分布和流量曲线并从CFD计算结果中提取。力和压力的数值结果与倾斜度低于5°的实验非常吻合,并且表明在低角度下,升力与角度成正比。在准静态方法的框架内,施加在轴向流动的圆柱体上的瞬时阻尼力等于施加在倾斜流动的圆柱体上的法向力。

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