Smoothed particle hydrodynamics and element bending group modeling of flexible fibers interacting with viscous fluids.
Smoothed particle hydrodynamics and element bending group modeling of flexible fibers interacting with viscous fluids.
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DOI：
10.1103/physreve.90.063011
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发表时间：
2014-12
期刊：
影响因子：
--
通讯作者：
Xiufeng Yang;Moubin Liu;Shiliu Peng
中科院分区：
文献类型：
--
作者：
Xiufeng Yang;Moubin Liu;Shiliu Peng
提出了一种光滑粒子流体动力学（SPH）和单元弯曲群（EBG）耦合方法，用于模拟柔性纤维与运动粘性流体的相互作用。SPH方法是一种成熟的无网格粒子方法，用于模拟粘性流体流动。EBG也是一种用于柔性体建模的粒子方法。柔性纤维与运动粘性流体的相互作用是通过柔性纤维的EBG粒子和流体的SPH粒子的相互作用来呈现的。在数值模拟中，将不同长度的柔性纤维浸入由体积力驱动的运动粘性流体中。由SPH-EBG模拟得到的纤维上的拖曳力与实验观察吻合得很好。结果表明，柔性纤维表现出三种典型的弯曲模式，包括U形模式，扑动模式，和封闭模式，柔性纤维经历了阻力减少，由于其重新配置弯曲。研究还发现，柔性纤维的U 4/3阻力标度律只适用于U形模态，而不适用于扑动模态和闭合模态。结果表明，柔性纤维的重构是由流体力引起的，而旋涡脱落在弯曲模态的转换中起着重要作用。
This paper presents a smoothed particle hydrodynamics (SPH) and element bending group (EBG) coupling method for modeling the interaction of flexible fibers with moving viscous fluids. SPH is a well-developed mesh-free particle method for simulating viscous fluid flows. EBG is also a particle method for modeling flexible bodies. The interaction of flexible fibers with moving viscous fluids is rendered through the interaction of EBG particles for flexible fiber and SPH particles for fluid. In numerical simulation, flexible fibers of different lengths are immersed in a moving viscous fluid driven by a body force. The drag force on the fiber obtained from SPH-EBG simulation agrees well with experimental observations. It is shown that the flexible fiber demonstrates three typical bending modes, including the U-shaped mode, the flapping mode, and the closed mode, and that the flexible fiber experiences a drag reduction due to its reconfiguration by bending. It is also found that the U4/3 drag scaling law for a flexible fiber is only valid for the U-shaped mode, but not valid for the flapping and closed modes. The results indicate that the reconfiguration of a flexible fiber is caused by the fluid force acting on it, while vortex shedding is of importance in the translations of bending modes.