Computational analysis of flow-driven string dynamics in a pump and residence time calculation
Computational analysis of flow-driven string dynamics in a pump and residence time calculation
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泵中流动驱动管柱动力学的计算分析和停留时间计算
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发表时间：
2019
期刊：
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通讯作者：
Isono Miho
中科院分区：
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作者：
Kenji Komiya;Taro Kanai;Yuto Otoguro;M. Kaneko;K. Hirota;Y. Zhang;K. Takizawa;T. Tezduyar;M. Nohmi;T. Tsuneda;Masahito Kawai;Isono Miho
本文给出了泵内流体驱动管柱动力学的计算分析和相关停留时间的计算。研究的目的是了解流体携带的管柱如何与泵表面（包括叶片）相互作用，以及如何卡在这些表面上或周围。停留时间的计算帮助我们对管柱的行为有一个简单而快速的理解。其核心计算方法是空时变分多尺度（ST- vms）方法，其他关键方法有ST等几何分析（ST- iga）、ST滑移界面（ST- si）方法、ST/NURBS网格更新方法（STNMUM）、复杂几何图形通用NURBS网格生成方法和弦动力学单向依赖模型。具有空间NURBS基函数的ST-IGA在流体力学和管柱结构动力学中都有应用。ST框架提供了更高阶的精度。ST-VMS的VMS特性解决了与非定常流的湍流特性相关的计算挑战，ST框架的移动网格特性实现了转子表面附近的高分辨率计算。ST-SI实现了旋转转子的动网格计算。覆盖转子的网格随其旋转，旋转网格与其余网格之间的SI精确地连接了溶液的两侧。ST-IGA能够更准确地表示泵的几何形状，并提高了流体解决方案的精度。IGA离散化还可以提高结构动力学解决方案的准确性，以及管柱形状和计算管柱流体动力学力的平稳性。STNMUM可以精确地表示网格旋转。通用的NURBS网格生成方法使处理复杂几何图形变得更加容易。利用单向依赖模型，我们计算了流动对管柱动力学的影响，同时避免了计算管柱对流动影响的艰巨任务，我们期望的影响很小。
We present computational analysis of flow-driven string dynamics in a pump and the related residence time calculation. The objective in the study is to understand how the strings carried by a fluid interact with the pump surfaces, including the blades, and get stuck on or around those surfaces. The residence time calculations help us to have a simplified but quick understanding of the string behavior. The core computational method is the Space–Time Variational Multiscale (ST-VMS) method, and the other key methods are the ST Isogeometric Analysis (ST-IGA), ST Slip Interface (ST-SI) method, ST/NURBS Mesh Update Method (STNMUM), a general-purpose NURBS mesh generation method for complex geometries, and a one-way-dependence model for the string dynamics. The ST-IGA with NURBS basis functions in space is used in both fluid mechanics and string structural dynamics. The ST framework provides higher-order accuracy. The VMS feature of the ST-VMS addresses the computational challenges associated with the turbulent nature of the unsteady flow, and the moving-mesh feature of the ST framework enables high-resolution computation near the rotor surface. The ST-SI enables moving-mesh computation of the spinning rotor. The mesh covering the rotor spins with it, and the SI between the spinning mesh and the rest of the mesh accurately connects the two sides of the solution. The ST-IGA enables more accurate representation of the pump geometry and increased accuracy in the flow solution. The IGA discretization also enables increased accuracy in the structural dynamics solution, as well as smoothness in the string shape and fluid dynamics forces computed on the string. The STNMUM enables exact representation of the mesh rotation. The general-purpose NURBS mesh generation method makes it easier to deal with the complex geometry. With the one-way-dependence model, we compute the influence of the flow on the string dynamics, while avoiding the formidable task of computing the influence of the string on the flow, which we expect to be small.