  Microswimmers such as E. Coli bacteria accumulate and exhibit an intriguing
dynamics near walls, governed by hydrodynamic and steric interactions. Insight
into the underlying mechanisms and predominant interactions demand a detailed
characterization of the entrapment process. We employ a mesoscale hydrodynamics
simulation approach to study entrapment of a E. coli-type cell at a no-slip
wall. The cell is modeled by a spherocylindrical body with several explicit
helical flagella. Three stages of the entrapment process can be distinguished:
the approaching regime, where a cell swims toward the wall on a nearly straight
trajectory; a scattering regime, where the cell touches the wall, with an
reorientation; and a surface-swimming regime. Our simulations show that steric
interactions may dominate the entrapment process, yet, hydrodynamic
interactions slow down the adsorption dynamics close to the boundary and imply
a circular motion on the wall. The locomotion of the cell is characterized by a
strong wobbling dynamics, with cells preferentially pointing toward the wall.
