Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 67: Poster: Active Matter, Microswimmers

DY 67.17: Poster

Thursday, March 15, 2018, 15:30–18:00, Poster A

Modeling of amoeboid swimmer in confined channel — •Swapnil Dalal, Alexander Farutin, and Chaouqi Misbah — Laboratoire interdisciplinaire de physique (LIPHY), CNRS and Université Grenoble Alpes, F-38000 Grenoble, France

Several micro-organisms (Euglena, Eutreptiella Gymnastica), eukaryotic cells (neutrophils, leukocytes, fibroblasts and cancer cells) undergo shape deformation in order to propel themselves. This self propulsion strategy is referred as amoeboid swimming. We study amoeboid swimming by modeling swimmer as deformable body with an inextensible membrane subjected to local distribution of active forces such that total force and torque acting on swimmer vanishes. This instantaneous local distribution of active force used in this study is dependent on the instantaneous swimmer shape. The active forces applied on the swimmer should instigate its locomotion based on its non reciprocal cyclic deformation in the Stokes flow regime. The active forces in this study are described using correlation function obtained using instantaneous local deformation of swimmer and is time independent. This gives rise to autonomous amoeboid swimmer that adapts itself based on surrounding environment. We study effect of confinement on self adapting amoeboid swimmer. Due to shape dependent active forces, the stroke period of swimmer is a function of confinement and it increases with confinement strength. The swimmer velocity exhibits nonmonotonic behaviour as a function of confinement. The swimmer behaviour averaged over one swimming cycle exhibits pusher nature at lower confinement while it shows puller characteristics at higher confinement.