Pairwise interactions between model swimmers at intermediate Reynolds numbers

Dombrowski, Thomas; Nguyen, Hong; Klotsa, Daphne

doi:10.1103/physrevfluids.7.074401

Cited by 3 publications

(2 citation statements)

References 84 publications

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“…2(j)]. Curiously, this rich catalog of bound modes shares many similarities with recent numerical predictions of pairwise bound modes for fully immersed two-sphere swimmers at intermediate Reynolds number [64] despite the apparently different fluid mechanisms mediating the interactions. In particular, the two-sphere swimmer recovers stable modes with similar arrangements to the following, back-toback, promenade, and orbiting modes observed in the present interfacial system.…”

supporting

confidence: 75%

Capillary surfers: Wave-driven particles at a vibrating fluid interface

Ho,

Pucci,

Oza

et al. 2023

Phys. Rev. Fluids

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We present an experimental study of capillary surfers, a new fluid-mediated active system that bridges the gap between dissipation-and inertia-dominated regimes. Surfers are wave-driven particles that self-propel and interact on a fluid interface via an extended field of surface waves. A surfer's speed and interaction with its environment can be tuned broadly through the particle, fluid, and vibration parameters. The wave nature of interactions among surfers allows for multistability of interaction modes and promises a number of novel collective behaviors.

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supporting

confidence: 75%

Capillary surfers: Wave-driven particles at a vibrating fluid interface

Ho,

Pucci,

Oza

et al. 2023

Phys. Rev. Fluids

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“…Employing both numerical simulations and analytical calculations, they discovered that swimmers with weak dipole forces and strong puller characteristics align perpendicularly to the interface and eventually halt, whereas strong pushers tend to navigate along the interface toward areas of lower viscosity. Additionally, the fluid dynamics of squirmers have been studied in various fluidic conditions, including under gravitational influence at low Reynolds numbers (Rühle and Stark 2020), at intermediate Reynolds numbers (Dombrowski et al 2022), and in proximity to surfaces (Shen et al 2018). In a recent study, Liu et al (2022) utilized the lattice Boltzmann method (LBM) to examine the migration and rheology of elliptical swimmers in Poiseuille flow, identifying five distinct migration modes and three rheological states.…”

Section: Introductionmentioning

confidence: 99%

Motion characteristics of squirmers in linear shear flow

Guan,

Ying,

Lin

et al. 2024

Fluid Dyn. Res.

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In this study, the two-dimensional lattice Boltzmann method was employed to simulate the motions and distributions of a circular squirmer in a linear shear flow. The objective was to systematically investigate the dynamics of microorganisms or engineered squirmers in a flowing environment. We conducted multiple simulations across a range of self-propelled strengths (0.08 ≤ α ≤ 0.8) and squirmer type parameters (-5 ≤ β ≤ 5). Initially, we analyzed the swimming motions of the neutral squirmer (β = 0) in the shear flow. Our analysis revealed two distinct distributions depending on , i.e., near the bottom or the top plate, which differs from conventional particle behavior. Moreover, we observed that the separation point of these two distributions occurs at αc = 0.41. The puller and pusher exhibit similarities and differences, with both showing a periodic oscillation pattern (POP). Additionally, both types reach a steady inclined pattern near the plate (SIP), with the distinction that the low-pressure region of the puller's head is captured by the plate, whereas the pusher is captured by the low-pressure region on the side of the body. The limit cycle pattern (LCP) is unique to the pusher because the response of the pressure distribution around the pusher to the flow field is different from that of a puller. The pusher starts from the initial motion and asymptotes to a closed limit cycle under the influence of flow-solid interaction. The frequency f of LCP is inversely proportional to the amplitude h* because the pusher takes longer to complete a larger limit cycle. Finally, an open limit cycle is shown, representing a swimming pattern that crosses the width of the channel.

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Swarm of slender pusher and puller swimmers at finite Reynolds numbers

Cavaiola

2022

Physics of Fluids

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The study of the flow field resulting from suspensions of swimmers at moderate Reynolds numbers, along with hydrodynamic interactions, has received little attention until now despite being of great interest to researchers in the fields of marine ecology, biology, and engineering. By means of direct numerical simulations, employing a state-of-the-art fully resolved immersed boundary method, the suspensions of inertial slender pusher and puller swimmers are investigated in dilute volume fractions and swimming Reynolds numbers ranging from 1 to 50 with the objective to identify the existence of correlated flow motions and scales when inertia plays a crucial role. The properties of the flow field resulting from the collective motion of the swimmers, as well as the characteristics of their orientation along with their temporal correlation, have been analyzed. Results show nontrivial flow motions as the Reynolds number changes along with a complex swimmer dynamics.

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Pairwise interactions between model swimmers at intermediate Reynolds numbers

Cited by 3 publications

References 84 publications

Capillary surfers: Wave-driven particles at a vibrating fluid interface

Capillary surfers: Wave-driven particles at a vibrating fluid interface

Motion characteristics of squirmers in linear shear flow

Swarm of slender pusher and puller swimmers at finite Reynolds numbers

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