【摘要】 在低雷诺数下,应用有限元数值模型计算了带有三扰流翼板圆柱的涡激振动问题,研究涡的释放形式和圆柱的振动幅度.在数值模型中,针对低雷诺数外部流场采用无量纲的N-S方程,三扰流翼板圆柱振动简化为质量-弹簧的断面系统,通过在流固边界上位移与应力的反复迭代,进行三扰流翼板圆柱与外部流场耦合计算,计算结果表明triangle60型的三扰流翼板可以明显地减小圆柱的涡激振动.更多还原

【Abstract】 This paper investigates vortex induced vibration and response amplitudes of a cylinder with three disturbing fins exposed to uniform flow at a low Reynolds number by using a finite element numerical model.Dimensionless incompressible Navier-Stokes equations were used to simulate the flow field around cylinder.The vibratory cylinder with or without three disturbing fins in flow field may be approximated as a mass-spring system.The fluid-solid coupling of the finned cylinder with external flow field is numerically simulated by applying iterative computation to the displacements and stresses on the fluid-solid interfaces.The remarkable decrease of response amplitude with the use of equilateral triangular fins is found,comparing with bare cylinder.更多还原