Wall-curvature driven dynamics of a microswimmer

Microorganisms navigate through fluid, often confined by complex environments, to survive and sustain life. Inspired this fact, we consider a model system seek understand the wall curvature driven dynamics of squirmer, mathematical for microswimmer, using (i) lattice Boltzmann simulations (ii) analytical theory \citet{dario_gareth}. The instantaneous is presented in terms fluid velocity fields, translational angular velocities whereas long time plotting squirmer trajectories near curved boundaries physical dynamical space, as well characterising them proximity parameter, retention time, (iii) swimmer orientation (iv) tangential boundary, (v) scattering angle during collision. Our detailed analysis shows that irrespective type strength, microswimmers exhibit greater affinity towards concave boundary due hydrodynamic interactions compared convex boundary. In presence additional repulsive with find pullers (propel forward thrust) have slightly convex--curved walls pushers backward thrust). study provides comprehensive understanding consequence unified framework encompasses pullers, pushers, neutral swimmers neighbourhood flat, concave, walls. addition, combined effect oppositely surfaces studied confining an annulus. results insights obtained are expected be useful design geometrical confinements control guide motion microfluidic applications.