The motion of the solid particles in the enclosed cavity is important, to investigate the interaction between the motion of the solid particles and the fluid flow, the motion of a neutrally buoyant elliptical particle in a lid-driven square cavity is studied with the lattice Boltzmann method. To understand, predict and control the motion of the elliptical particle, the effects of the aspect ratio, initial orientation, initial position, particle size and Reynolds number are studied. The obvious characteristic of the motion of the elliptical particle in the square cavity is the existence of the limit cycle, which is created by the inertia of the elliptical particle, confinement of the boundaries of the square cavity and vortex behavior. Compared with the circular particle, with the increase of the aspect ratio, the roundness of the limit cycle decreases, namely, the limit cycle becomes flatter. Especially, the limit cycle is insensitive to the initial orientation and position, namely, the limit cycle is the same no matter where the elliptical particle is placed initially. With the increase of the particle size, the confinement of the boundaries becomes stronger, and the limit cycle is squeezed toward the center of the square cavity. Finally, with the increase of the Reynolds number, the vortex at the top left corner develops, and the limit cycle is pushed toward the bottom right corner of the square cavity.

封闭腔中固体颗粒的运动很重要，为了研究固体颗粒的运动与流体流动之间的相互作用，利用玻尔兹曼格子研究了盖子驱动方腔中的中性浮力椭圆形颗粒的运动。方法。为了理解，预测和控制椭圆粒子的运动，研究了纵横比，初始方向，初始位置，粒径和雷诺数的影响。椭圆粒子在方腔中运动的明显特征是存在极限环，该极限环是由椭圆粒子的惯性，方腔边界的限制和涡旋行为造成的。与圆形粒子相比，随着长宽比的增加，极限循环的圆度降低，即极限循环变得平坦。特别地，极限循环对初始取向和位置不敏感，即，不管初始放置在何处，极限循环都是相同的。随着粒径的增加，边界的限制变得更强，并且极限循环被挤压向方腔的中心。最后，随着雷诺数的增加，左上角的涡旋发展，极限环被推向方腔的右下角。随着颗粒尺寸的增加，边界的限制变得更强，并且极限循环被挤压向方腔的中心。最后，随着雷诺数的增加，左上角的涡旋发展，极限环被推向方腔的右下角。随着粒径的增加，边界的限制变得更强，并且极限循环被挤压向方腔的中心。最后，随着雷诺数的增加，左上角的涡旋发展，极限环被推向方腔的右下角。