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Janus phoretic particles exploit chemical energy stored in their environmentto self-propel. These active particles modify and respond to their hydrodynamicand chemical environments, thus giving them a sensibility to external flows andother particles. Furthermore, experimental observations and analysis onbiological or synthetic active suspensions indicate that hydro-chemicalinterparticle interactions lead to non-trivial collective behaviour (e.g.,cluster formation of phoretic particles or bacterial swarming) and that theresponse of the suspensions to shear flows is non-trivial. In fact, it can leadto significant reductions in viscosity due to the energy conversion atmicroscopic scales. In this work, using simulations of a continuum kineticmodel, we analyse the dynamics and response to shear and confinement of dilutesuspensions of chemotactic phoretic particles that reorient and drift towardthe chemical solutes released by their neighbours. We show that a 1D transientsteady distribution driven by the effect of confinement is a common featureconsidered and analyse its stability for varying confinement strength and shearrate. In the second step, we consider and discuss, more specifically, thefeedback effect on the flow by the particle and the resulting effectiveviscosity of the suspension.

Self-organisation of auto-phoretic suspensions in confined shear flows