Regensburg 2016 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 41: Microswimmers II (Joint Session with DY)
BP 41.6: Vortrag
Mittwoch, 9. März 2016, 12:45–13:00, H45
Elastic microswimmers in confined spaces — •Jayant Pande1, Timm Krüger2, Jens Harting3,4, and Ana-Sunčana Smith1,5 — 1PULS group, Dept. of Phys. and EAM Cluster of Excellence, Friedrich-Alexander Univ., Erlangen, Germany — 2School of Engg., Univ. of Edinburgh, Edinburgh, U.K. — 3Dept. of Appl. Phys., Eindhoven Univ. of Technology, Eindhoven, The Netherlands — 4Research Centre Jülich, Helmholtz-Inst. Erlangen-Nuremberg, Nuremberg, Germany — 5Div. of Phys. Chem., Ruđer Bošković Inst., Zagreb, Croatia
Both natural microswimmers such as bacteria and artificial ones such as microscopic drug delivery systems (as currently foreseen) commonly move through constrained spaces such as thin films or biological channels. This constrainment alters their conditions of motion, relative to swimming in an infinite expanse of fluid, due to effects such as fluid reflection from channel walls, heightened drag forces, etc., and is manifested in fundamentally different fluid flow fields. We study these effects by employing the LB3D simulation system, based on the lattice-Boltzmann and immersed boundary methods, to simulate the three-sphere swimmer of Najafi and Golestanian as it moves through narrow and wide channels. We modify the original three-sphere model to allow different degrees of elasticity in the swimmer, and investigate the interplay of these degrees of elasticity with the channel shapes and dimensions in determining the swimming efficiency. We present ways to take the swimmer elasticity into consideration analytically, and show that motion within channels may be understood in terms of the swimming regimes that depend on the drag force faced by the swimmer.