We develop a novel Moving Particle Simulation (MPS) method to reproduce the motion of fibers floating in sheared liquids accurately. In conventional MPS schemes, if a fiber suspended in a liquid is represented by a one-dimensional array of MPS particles, it is entirely aligned to the flow direction due to the lack of shear stress difference between fiber–liquid interfaces. To address this problem, we employ the micropolar fluid model to introduce rotational degrees of freedom into the MPS particles. The translational motion of liquid and solid particles and the rotation of solid particles are calculated with the explicit MPS algorithm. The fiber is modeled as an array of micropolar fluid particles bonded with stretching, bending and torsional potentials. The motion of a single rigid fiber is simulated in a three-dimensional shear flow generated between two moving solid walls. We show that the proposed method is capable of reproducing the fiber motion predicted by Jeffery's theory which is different from the conventional MPS simulations.

中文翻译：

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通过引入稀纤维悬浮液的旋转自由度来扩展运动粒子模拟

我们开发了一种新颖的移动粒子模拟（MPS）方法，可以准确地再现漂浮在剪切液体中的纤维的运动。在传统的 MPS 方案中，如果悬浮在液体中的纤维由 MPS 颗粒的一维阵列表示，则由于纤维-液体界面之间缺乏剪切应力差异，它完全与流动方向对齐。为了解决这个问题，我们采用微极性流体模型将旋转自由度引入 MPS 粒子。采用显式MPS算法计算液体和固体颗粒的平动运动以及固体颗粒的旋转。该纤维被建模为具有拉伸、弯曲和扭转势能的微极性流体颗粒阵列。在两个移动固体壁之间产生的三维剪切流中模拟单个刚性纤维的运动。我们表明，所提出的方法能够再现 Jeffery 理论预测的纤维运动，这与传统的 MPS 模拟不同。