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RESEARCH ON CROSS FLOW INDUCED VIBRATION OF FLEXIBLE TUBE BUNDLE

机译:挠性管束横流诱发振动的研究

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When the elastic deformation of the tube bundle is considered, the interaction between the flow field and the structure becomes more complicated. In order to investigate the flow induced vibration (FIV) problems in flexible tube bundle, a numerical model for fluid-structure interaction system was presented firstly. The unsteady three-dimensional Navier-Stokes equation and LES turbulence model were solved with the finite volume approach on structured grids combined with the technique of dynamic mesh. The dynamic equilibrium equation was discretized according to the finite element theory. The configurations considered are tubes in a cross flow. Firstly, the flow-induced vibration of a single flexible tube under uniform turbulent flow are calculated when Reynolds number is 1.35×10~4. The variety trends of lift, drag, displacement, vertex shedding frequency, phase difference of tube are analyzed under different frequency ratios. The nonlinear phenomena of locked-in, phase-switch are captured successfully. Meanwhile, the limit cycle and bifurcation of lift coefficient and displacement are analyzed using trajectory, phase portrait and Poincare sections. Secondly, the mutual interaction of two in-line flexible tubes is investigated. Different behaviors, bounded by critical distances between the tubes, critical velocity, and wake vortex pattern are highlighted. Finally, four tube bundle models were established to study the effect of the number of flexible tube on the FIV characteristics. Thanks to several calculations, the critical velocity of instability vibration and the effect of tube bundle configurations on fluid forces and dynamics were obtained successfully. It is therefore expected that further calculations, with model refinements and other validation studies, will bring valuable informations about bundle stability. Further comparisons with experiment are necessary to validate the behavior of the method in this configuration.
机译:当考虑管束的弹性变形时,流场与结构之间的相互作用变得更加复杂。为了研究挠性管束中的流动引起的振动(FIV)问题,首先建立了流固耦合系统的数值模型。结合动态网格技术,利用结构网格上的有限体积法求解了非稳态三维Navier-Stokes方程和LES湍流模型。根据有限元理论将动平衡方程离散化。所考虑的配置是错流的管道。首先,计算了雷诺数为1.35×10〜4时,在均匀湍流作用下单个软管的流动引起的振动。分析了不同频率比下的升力,阻力,位移,顶点脱落频率,相差的变化趋势。锁定相位切换的非线性现象已被成功捕获。同时,利用轨迹,相图和庞加莱截面对极限环和升力系数与位移的分叉进行了分析。其次,研究了两个直列挠性管之间的相互作用。突出显示了不同的行为,这些行为受管之间的临界距离,临界速度和尾涡模式的限制。最后,建立了四个管束模型以研究柔性管数量对FIV特性的影响。通过多次计算,成功获得了不稳定振动的临界速度以及管束配置对流体力和动力学的影响。因此,期望通过模型改进和其他验证研究进行进一步的计算,将带来有关束稳定性的有价值的信息。为了验证该配置方法的性能,有必要与实验进行进一步比较。

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