Chemoreception and chemotaxis of a three-sphere swimmer

The coupled problem of hydrodynamics and solute transport for the Najafi-Golestanian three-sphere swimmer is studied, with Reynolds number set to zero P\'eclet numbers (Pe) ranging from 0.06 60. adopted method numerical simulation a finite element code based upon FEniCS library. For executing optimal locomotion gait, we report Sherwood as function Pe in homogeneous fluids confirm that little gain flux achieved by swimming unless significantly larger than 10. We also consider an learning agent moving inside fluid has concentration gradient. outcomes Q-learning processes show (with displacement reward) easier chemotaxis increase reward). problem, even at low Pe, varying environment renders more difficult. Further, difficulty increases severely number. results demonstrate challenges natural artificial swimmers need overcome migrate efficiently when exposed chemical inhomogeneities.