Three-Dimensional Instability of an Oscillating Viscous Flow Past a Circular Cylinder
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摘要: 通过数值求解三维不可压缩Navier-Stokes方程,研究了振荡圆柱绕流的旋涡不稳定性.研究表明,在一定的参数范围内,由于旋涡不稳定性,振荡流动由二维演化成三维流动,并沿圆柱轴向形成交错排列的三维涡结构.数值计算合理地预测了三维涡结构的空间失稳波长,并与实验测试值相符很好.文中还进一步研究了圆柱的受力特性,通过求解Morison方程,计算了圆柱的阻力和惯性力特性,其计算结果与已有的实验数据相吻合.
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关键词:
- Navier-Stokes方程 /
- Reynolds数 /
- Keulegan-Carpenter数 /
- Morison方程
Abstract: A systematically numerical study of the sinusoidally oscillating viscous flow around a circular cylinder was performed to investigate vortical instability by solving the three-dimensional incompressible Navier-Stokes equations.The transition from twoto three-dimensional flow structures along the axial direction due to the vortical instability appears,and the three-dimensional structures lie alternatively on the two sides of the cylinder.Numerical study has been taken for the Keulegan-Carpenter(KC) numbers from 1 to 3.2 and frequency parameters from 100 to 600.The force behaviors are also studied by solving the Morison equation.Calculated results agree well with experimental data and theoretical prediction.-
Key words:
- Navier-Stokes equation /
- Reynolds number /
- Keulegan-Carpenter number /
- Morison equation
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