论文标题
模拟流动管中圆柱体振动的仿真
Simulation of flow induced vibration of a cylinder in an expansion tube
论文作者
论文摘要
在这项研究中，进行了一系列模拟，以研究膨胀管中小圆柱体的运动，重点是二维动力学。这些仿真是在使用占用功能的流利平台上进行的。气缸和管壁之间的碰撞被建模为刚体的正碰撞而不会损失能量。在4.9-79.4和1-300的范围内探索了两个关键参数，分别是无量纲的重力（mg*）和雷诺数（RE）。考虑了两种类型的流入：不变的流入或叠加的正弦曲调流入周期性波动。对于不变的流入，在（mg*，re）的相图中找到了三种运动模式（排水模式，平衡模式和振动模式）。对于不变的流入，事实证明，圆柱体的高振幅振动在雷诺数中被广泛扩展到5到40。当忽略球形运动时，可以将二维圆柱体的行为近似为三维球的简化版本。我们的研究可能有助于理解这一古老的流动问题。
In this study, a series of simulations are conducted to investigate the motion of a small cylinder in an expansion tube, focusing on two-dimensional dynamics. These simulations are performed on the FLUENT platform employing the Overset function. The collision between the cylinder and the tube wall is modeled as a positive rigid body collision without losing energy. Two key parameters, the dimensionless gravity (Mg*) and the Reynolds number (Re), were explored within the ranges of 4.9-79.4 and 1-300, respectively. Two types of inflow are considered: the invariable inflow or superimposed a sinusoidal inflow of periodical fluctuation. For invariable inflow, three motion modes (drainage mode, balance mode and vibration mode) are found in the phase diagrams of (Mg*, Re). For an invariable inflow, the high-amplitude vibrations of a cylinder is proved to be widespread in the Reynolds number range from 5 to 40. Additionally, the scenario involving Re =300, Mg* =39.25 with sinusoidal periodic fluctuation incoming flow demonstrated intense vibrations of the cylinder. The behavior of the two-dimensional cylinder can be approximated as a simplified version of a three-dimensional sphere when the spherical motion is disregarded. Our research may help to understand this ancient flow problem.
