Quantitative analysis of the gain in probability of escaping for ideal phototactic swimmers due to chaotic dynamics

Grados, Alfredo J.; Vilela, Rafael D.

doi:10.1103/physreve.101.052617

Cited by 1 publication

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“…Figure 4. Probability of noise-induced-rising in a cellular flow as a function of (Λ d /v d ) √ St.The continuous curve corresponds to the master curve predicted theoretically, equation(9). The numerical results correspond to simulations for three different swimmers species.…”

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confidence: 82%

“…Swimming microorganisms and artificial micro swimmers display a plethora of complex behaviors which have stimulated much work in areas such as fluid dynamics, statistical physics, and nonlinear dynamics [1][2][3][4][5][6][7][8][9]. A notable motile strategy used by flagellated bacteria such as Escherichia coli (E. coli) is run-and-tumble [10].…”

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confidence: 99%

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Dynamics and sorting of run-and-tumble particles in fluid flows with transport barriers

Vilela,

Grados,

Angilella

2024

J. Phys. Complex.

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We investigate the dynamics of individual run-and-tumble particles in a convective flow which is a prototype of fluid flows with transport barriers. We consider the most prevalent case of swimmers denser than the background fluid. As a result of gravity and the effects of the carrying flow, in the absence of swimming the particles either sediment or remain in a convective cell. When run-and-tumble also takes place, the particles may move to upper convective cells. We derive analytically the probability of uprise. Since that probability in a given fluid flow can vary strongly accross species, our findings inspire a purely dynamical mechanism for species extraction in the dilute regime. Numerical simulations support our analytical predictions and demonstrate that a judicious choice of the fluid flow’s parameters can lead to particle sorting with an arbitrary degree of purity.

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confidence: 82%