正方形排布管束流体弹性不稳定性数值计算模型研究

A numerical model for fluid-elastic instability of a square tube array

研究了正方形排布管束的流体弹性不稳定的数值计算模型。在刚体运动方程与Newmark积分方法的基础上建立了三维流固耦合振动模型。对湍流模型与模型的轴向尺寸影响进行了计算分析研究,结果表明采用LES模型比RANS模型更为准确,轴向尺寸d的模型可以反映完整的流场信息,在此基础上,提出了适用的计算模型。采用计算模型对临界流速进行了计算,并同文献实验数据进行了对比,结果显示计算的临界流速同实验数据吻合较好,振幅计算在低速时精度较高,在高速时误差较大。研究结果为数值计算模型的应用提供了参考和依据。

A numerical model of fluid-elastic instability of a square tube array was studied here. A 3D fluid- structure interaction vibration model was established based on rigid-body motion equations and Newmark integral method. Influences of a turbulence model and its axial sizes were analyzed. A proper analysis model was obtained. The model was adopted to compute critical velocity and the results were compared with the test data in references. The results showed that the computed critical velocity is well coincidence with the test data; the computed vibration amplitudes are precise at lower velocity, but have a lager error at higher velocity. The study results provided a referenee for numerical model applications.