Figure 1.

(a) Schematic of the one-tailed model bacterium near a wall with geometrical parameters labelled. The reference points and basis vectors (${\overrightarrow{e}}_2^{\mathrm{B}}$ and ${\overrightarrow{e}}_2^{\mathrm{F}}$ omitted for clarity) as well as the height h and inclination angle $\theta$ relative to the wall are also indicated. (b) Schematic of the two-tailed model bacterium showing the reference points and basis vectors of the body and two tails (omitting out-of-plane vectors for clarity) as well as the defining angles $\alpha$ and $\gamma$. Here, $\alpha =0.35\pi$ and $\gamma =0.15\pi$. The body and flagellum shape illustrated are those used in the presented results.