中国物理B ›› 2024, Vol. 33 ›› Issue (4): 44501-044501.doi: 10.1088/1674-1056/ad1a8d

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Passive particles driven by self-propelled particle: The wake effect

Kai-Xuan Zheng(郑凯选)1, Jing-Wen Wang(汪静文)1, Shi-Feng Wang(王世锋)2,†, and De-Ming Nie(聂德明)1   

  1. 1 Institute of Fluid Mechanics, China Jiliang University, Hangzhou 310018, China;
    2 Department of Mechanical Engineering, Hangzhou Vocational & Technical College, Hangzhou 310018, China
  • 收稿日期:2023-10-16 修回日期:2023-12-14 接受日期:2024-01-04 出版日期:2024-03-19 发布日期:2024-03-22
  • 通讯作者: Shi-Feng Wang E-mail:wsf@hzvtc.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12132015 and 11972336).

Passive particles driven by self-propelled particle: The wake effect

Kai-Xuan Zheng(郑凯选)1, Jing-Wen Wang(汪静文)1, Shi-Feng Wang(王世锋)2,†, and De-Ming Nie(聂德明)1   

  1. 1 Institute of Fluid Mechanics, China Jiliang University, Hangzhou 310018, China;
    2 Department of Mechanical Engineering, Hangzhou Vocational & Technical College, Hangzhou 310018, China
  • Received:2023-10-16 Revised:2023-12-14 Accepted:2024-01-04 Online:2024-03-19 Published:2024-03-22
  • Contact: Shi-Feng Wang E-mail:wsf@hzvtc.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12132015 and 11972336).

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摘要： This work focuses on numerically studying hydrodynamic interaction between a passive particle and a self-propelled particle, termed a squirmer, by using a two-dimensional lattice Boltzmann method (LBM). It is found that the squirmer can capture a passive particle and propel it simultaneously, provided the passive particle is situated within the squirmer's wake. Our research shows that the critical capture distance, which determines whether the particle is captured, primarily depends on the intensity of the squirmer's dipolarity. The stronger dipolarity of squirmer results in an increased critical capture distance. Conversely, the Reynolds number is found to have minimal influence on this interaction. Interestingly, the passive particle, when driven by the squirmer's wake, contributes to a reduction in the squirmer's drag. This results in a mutual acceleration for both particles. Our findings can provide valuable perspectives for formulating the principles of reducing the drag of micro-swimmers and help to achieve the goal of using micro-swimmers to transport goods without physical tethers.

关键词: lattice Boltzmann method (LBM), self-propelled particles, particle-laden flow

Abstract: This work focuses on numerically studying hydrodynamic interaction between a passive particle and a self-propelled particle, termed a squirmer, by using a two-dimensional lattice Boltzmann method (LBM). It is found that the squirmer can capture a passive particle and propel it simultaneously, provided the passive particle is situated within the squirmer's wake. Our research shows that the critical capture distance, which determines whether the particle is captured, primarily depends on the intensity of the squirmer's dipolarity. The stronger dipolarity of squirmer results in an increased critical capture distance. Conversely, the Reynolds number is found to have minimal influence on this interaction. Interestingly, the passive particle, when driven by the squirmer's wake, contributes to a reduction in the squirmer's drag. This results in a mutual acceleration for both particles. Our findings can provide valuable perspectives for formulating the principles of reducing the drag of micro-swimmers and help to achieve the goal of using micro-swimmers to transport goods without physical tethers.

Key words: lattice Boltzmann method (LBM), self-propelled particles, particle-laden flow

中图分类号:  (Dynamics and kinematics of a particle and a system of particles)

  • 45.50.-j
47.55.Kf (Particle-laden flows) 47.85.-g (Applied fluid mechanics)