Dresden 2017 – scientific programme

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BP: Fachverband Biologische Physik

BP 12: Microswimmers I (Joint Session DY/BP)

BP 12.8: Talk

Tuesday, March 21, 2017, 12:00–12:15, HÜL 186

Phase diagram of microswimmers in bulk — •Fabian Jan Schwarzendahl, Stephan Herminghaus, and Marco G. Mazza — Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 Göttingen, Germany

The hydrodynamic flow field of microswimmers such as bacteria or algae can be classified into two categories: pushers and pullers. Bacteria like E. coli create a force dipole pushing the fluid away at their front and rear. On the other hand algae like Chlamydomonas reinhartii create a force dipole that pulls the fluid towards them at the front and rear. We study the bulk behaviour of both types using a combination of molecular dynamic (MD) and stochastic rotational dynamic (SRD) simulations. Here, we use a minimal model for the swimmers accounting for hydrodynamic (SRD) as well as steric (MD) interactions. We find a rich phase diagram showing clustering as well as nematic states.