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The swimming properties of an E. coli-type model bacterium are investigatedby mesoscale hy- drodynamic simulations, combining molecular dynamicssimulations of the bacterium with the multiparticle particle collision dynamicsmethod for the embedding fluid. The bacterium is com- posed of aspherocylindrical body with attached helical flagella, built up from discreteparticles for an efficient coupling with the fluid. We measure the hydrodynamicfriction coefficients of the bacterium and find quantitative agreement withexperimental results of swimming E. coli. The flow field of the bacterium showsa force-dipole-like pattern in the swimming plane and two vor- ticesperpendicular to its swimming direction arising from counterrotation of thecell body and the flagella. By comparison with the flow field of a force dipoleand rotlet dipole, we extract the force- dipole and rotlet-dipole strengths forthe bacterium and find that counterrotation of the cell body and the flagellais essential for describing the near-field hydrodynamics of the bacterium.

Modelling the Mechanics and Hydrodynamics of Swimming E. coli