【摘要】 基于表面涡方法和流固耦合模型研究了Re=2.67×104时的单列圆柱流体诱导振动问题,计算了流体力、振动响应、涡脱落频率等,并给出了涡云图。计算模拟结果很好地重现了刚性单列圆柱在T/D=1.5(小间隙比)下以宽窄尾涡交替和多频为特征的非均匀流态,以及T/D=2.0的涡脱落现象。此外,该文还研究了单列弹性圆柱在T/D=1.5时的流体诱导振动以及流体弹性不稳定问题,计算了SG=1.29时圆柱列的无量纲临界速度。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 the 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 characterized by narrow and wide near wake, multiple frequencies, and the vortex shedding behind a rigid cylinder row with T/D = 2.0 are replicated properly by simulation results. Furthermore, the FIV and fluid elastic instability of a fully flexible cylinder row at T/D = 1.5 is studied. The critical reduced velocity of the cylinder row at SG = 1.29 is also calculated.更多还原