Regensburg 2022 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 11: Active Matter 2 (joint session DY/BP/CPP)
BP 11.9: Vortrag
Dienstag, 6. September 2022, 12:15–12:30, H18
The influence of motility on bacterial accumulation in a microporous channel — •Christoph Lohrmann1, Miru Lee2, and Christian Holm1 — 1Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2Institute for Theoretical Physics, Georg-August-Universität Göttingen, 37073 Göttingen, Germany
Swimming microorganisms are often encountered in confined geometries where also an external flow is present, e.g. in filters or inside the human body. To investigate the interplay between microswimmer motility and external flows, we developed a model for swimming bacteria based on point coupling to an underlying lattice Boltzmann fluid. Random reorientation events reproduce the statistics of the run-and-tumble motion of the bacterium E. coli. We present the application of the model to the study of bacterial dynamics in a channel with a single cylindrical obstacle. In accordance with experimental measurements, simulations show asymmetric accumulation behind the obstacle only when the bacteria are active and an external flow is present.
Lee, Miru et al., Soft Matter 17, 893-902 (2021)