Poiffille流中双凹颗粒的横向运动和非均匀旋转
Lateral Migration and Nonuniform Rotation of Biconcave Particle Suspended in Poiseuille Flow
摘要：
采用多重弛豫时间格子玻尔兹曼方法和伽利略不变动量交换方法研究了Poietille流中双凹粒子的运动。在我们的数值模拟中，粒子的横向迁移和平衡类似于Segré-Silberberg效应。令人惊讶的是，观察到两个横向平衡位置对应的双凹颗粒的释放位置。上平衡位置随雷诺数的增大而显著减小，而下平衡位置对雷诺数几乎不敏感。有趣的是，规则波伴随着不均匀的旋转表现在双凹粒子的横向运动。这是由于不同姿态的双凹形状与Poiffille流的抛物线速度分布相互作用的结果。一组等值线显示了双凹颗粒在旋转周期内具有连续姿态时的动态流场。
英文摘要：
A biconcave particle suspended in a Poiseuille flow is investigated by the multiple-relaxation-time lattice Boltzmann method with the Galilean-invariant momentum exchange method. The lateral migration and equilibrium of the particle are similar to the Segré-Silberberg effect in our numerical simulations. Surprisingly, two lateral equilibrium positions are observed corresponding to the releasing positions of the biconcave particle. The upper equilibrium positions significantly decrease with the growth of the Reynolds number, whereas the lower ones are almost insensitive to the Reynolds number. Interestingly, the regular wave accompanied by nonuniform rotation is exhibited in the lateral movement of the biconcave particle. It can be attributed to that the biconcave shape in various postures interacts with the parabolic velocity distribution of the Poiseuille flow. A set of contours illustrate the dynamic flow field when the biconcave particle has successive postures in a rotating period.
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