Lattice Boltzmann Study of a Vortex Ring Impacting Spheroidal Particles
Lattice Boltzmann Study of a Vortex Ring Impacting Spheroidal Particles
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DOI：
10.4208/aamm.2013.m395
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发表时间：
2014-08
影响因子：
1.4
通讯作者：
Chunlong Yu;Haibo Huang;Xi-yun Lu
中科院分区：
文献类型：
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作者：
Chunlong Yu;Haibo Huang;Xi-yun Lu
涡环与固体的相互作用是流体力学的一个重要研究课题。本文采用多重松弛时间(MRT)格子Boltzmann方法(LBM)研究了涡环撞击球形颗粒的流动。通过涡环撞击平壁的算例，验证了该方法的有效性。详细讨论了颗粒大小、长径比和雷诺数对涡旋演化的影响。当涡环撞击定常球体时，一次涡环和二次涡环相互缠绕，这与涡环撞击平板的情况不同。对于与长椭球碰撞的涡环，二次涡环主要沿椭球粒子的长轴伸展。但发现在涡旋包裹阶段后，初级涡沿颗粒短轴方向的恢复比沿颗粒长轴方向的恢复要快，即初级涡环主要沿颗粒短轴方向伸展。这在文学中从未被提及过。AMS科目分类：76D17
Interaction of vortex rings with solid is an important research topic of hy- drodynamic. In this study, a multiple-relaxation time (MRT) lattice Boltzmann method (LBM) is used to investigate the flow of a vortex ring impacting spheroidal particles. The MRT-LBM is validated through the cases of vortex ring impacting a flat wall. The vortex evolution due to particle size, the aspect ratio of a prolate particle, as well as Reynolds (Re) number are discussed in detail. When the vortex ring impacting a sta- tionary sphere, the primary and secondary vortex rings wraparoundeachother, which is different from the situation of the vortex ring impacting a plate. For the vortex ring impacting with a prolate spheroid, the secondary vortex ring stretches mainly along the long axis of the ellipsoid particle. However, it is found that after the vortex wrap- ping stage, the primary vortex recovers along the short axis of the particle faster than that in the long axis, i.e., the primary vortex ring stretches mainly along the short axis of the particle. That has never been address in the literature. AMS subject classifications: 76D17