【摘要】 基于表面涡方法和流固耦合模型,研究了雷诺数为2.67×104时的单列圆柱流体诱导振动问题,并计算了涡云图、流体力、振动响应、涡脱落频率等.计算模拟结果很好地重现了刚性单列圆柱在小间隙比(1.5)下以宽、窄尾涡交替和多频为特征的非均匀流态,以及间隙比为2.0时的涡脱落现象.此外,还研究了单列自由振动的弹性圆柱在间隙比为2.0时的流体诱导振动问题,结果表明:在大振幅条件下,流体诱导力在x方向和y方向有较强烈的耦合;随着振幅的减小,x方向振动对y方向振动的影响可以忽略,可采用单自由度的动力学模型假设进行计算.更多还原

【Abstract】 The cross-flow induced vibration of a row of cylinders at sub-critical Reynolds number Re=2.67×104 is simulated based on surface vorticity method and a fluid-structure interaction model incorporating the effects of cylinder motions and displacements.The computational results of the vorticity map,fluid force,vibration response,and shedding frequency are presented.The non-uniform flow behind a rigid cylinder row with a small pitch ratio T/D=1.5 is characterized by narrow and wide near wakes and multiple frequencies,and the vortex shedding behind a rigid cylinder row with T/D=2.0 is replicated properly by the simulation results.Furthermore,the flow induced vibration of a flexible cylinder row with T/D=2.0 is also investigated.The numerical results show that the coupling between x-and y-direction occurs obviously for large-amplitude vibration,and declines rapidly with the reduced vibration amplitude to be expected to choose single DOF dynamic model for the flow-induced vibration of a cylinder row.更多还原