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

机译:施加在轴向流动的长圆柱体上施加的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:该研究在雷诺数为27000的近轴流中调查圆柱体周围的流动。进行CFD计算和实验。针对低倾斜域(<15°)的圆柱体的倾斜度来研究提升力系数的时间平均值。还测量压力分布和流动谱,并从CFD计算结果中测量并提取特征倾斜α= 5°。力和压力的数值结果表明,与低于5°的倾斜度的实验表明公平协议,并揭示了在低角度下,提升力与角度成比例。在准静态方法的框架中,施加在轴向流动轴向流动上施加在轴向流动的瞬时阻尼力等同于施加在倾斜流动的圆柱体上的正常力。

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