Fig. 8: Influence of the Reynolds number.

a Dependence of the rotational diffusion enhancement \({D}_{r}^{a}/{D}_{r}^{p}\) for swimmers with no-slip (ns, dashed line) and repulsive (rp, solid line) boundary conditions on the Reynolds number at a temperature kBT/ϵ = 0.0005. Corresponding dependences of (b) the mean swimming velocity 〈U ⋅ e〉 and (c) translational diffusion enhancement \({D}_{t}^{a}/{D}_{t}^{p}\). Mean swimming velocities are normalized by their Newtonian fluid counterparts, 〈U⋅e〉N. Here, β denotes active stress. Blue, red, and green lines correspond to pushers, pullers, and neutral swimmers, respectively. The dotted line represents the reference curve.