2016
DOI: 10.1098/rsif.2015.0936
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Hotspots of boundary accumulation: dynamics and statistics of micro-swimmers in flowing films

Abstract: Biological flows over surfaces and interfaces can result in accumulation hotspots or depleted voids of microorganisms in natural environments. Apprehending the mechanisms that lead to such distributions is essential for understanding biofilm initiation. Using a systematic framework, we resolve the dynamics and statistics of swimming microbes within flowing films, considering the impact of confinement through steric and hydrodynamic interactions, flow and motility, along with Brownian and run-tumble fluctuation… Show more

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Cited by 32 publications
(31 citation statements)
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References 80 publications
(104 reference statements)
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“…All our parameter values have been estimated carefully from previous experiments and numerical results, as dis-cussed in MM § 4, and the results are qualitatively robust for changes in these parameters. A simulated trajectory starts with a random ψ and a slightly negative pitch angle, θ = −0.1π, and finishes when it reaches a given escape angle θ e [56][57][58]. Subsequently, the spatial dynamics are found by computing the velocity parallel to the surface, at a constant swimming speed v s plus the downstream advection with velocity v f =γyx based on the shear rate and the distance from the wall, y.…”
Section: Brownian Dynamics Simulationsmentioning
confidence: 99%
“…All our parameter values have been estimated carefully from previous experiments and numerical results, as dis-cussed in MM § 4, and the results are qualitatively robust for changes in these parameters. A simulated trajectory starts with a random ψ and a slightly negative pitch angle, θ = −0.1π, and finishes when it reaches a given escape angle θ e [56][57][58]. Subsequently, the spatial dynamics are found by computing the velocity parallel to the surface, at a constant swimming speed v s plus the downstream advection with velocity v f =γyx based on the shear rate and the distance from the wall, y.…”
Section: Brownian Dynamics Simulationsmentioning
confidence: 99%
“…Our findings, together with the early study of Lemelle et al. (), raise questions on the proper model for the liquid–air interface when modeling the fluid dynamics of biofilms, a topic that is recently attracting the interest of a multidisciplinary community due to its potential relevance in biofilm formation (see, e.g., Mathijssen et al ).…”
Section: Discussionmentioning
confidence: 67%
“…The swimming of single bacteria and the collective motion of microorganisms have attracted the interest of a varied community. Accumulation at interface (both solid–liquid and air–liquid) was studied with a number of theoretical (Ishimoto & Gaffney, ), computational (Costanzo, Di Leonardo, Ruocco, & Angelani, ; Mathijssen, Doostmohammadi, Yeomans, and Shendruk, ; Theers, Westphal, Gompper, & Winkler, ), and experimental approaches (Wioland, Lushi, & Goldstein, ), and several puzzling phenomena such as upstream flowing (Mathijssen, Shendruk, Doostmohammadi, Yeomans ) and oscillatory motion in microchannel (de Graaf et al., ) emerged when bacteria swim under strong confinement. The interaction of flagellated microswimmers with structured surfaces often results in swimmer trapping as shown in Sipos, Nagy, Di Leonardo, & Galajda () for convex wall and in Gu et al.…”
Section: Introductionmentioning
confidence: 99%
“…Additional investigations have considered the hydrodynamic interactions between two squirmers near a boundary 101 , the dynamics of active particles near a fluid interface [102][103][104] , swimming in a confining microchannel [105][106][107][108][109][110][111][112][113][114][115][116] , inside a spherical cavity [117][118][119] , near a curved obstacle 120,121 and in a liquid film [122][123][124] . Meanwhile, other studies have considered the low-Reynolds number locomotion in non-Newtonian fluids [125][126][127][128][129][130][131][132][133] where boundaries have been found to drastically alter the swimming trajectories of microswimmers. [134][135][136] .…”
Section: Introductionmentioning
confidence: 99%