Boundaries control active channel flows

Boundary conditions dictate how fluids, including liquid crystals, flow when pumped through a channel. Can boundary also be used to control internally driven active fluids that generate flows spontaneously? By using numerical simulations and stability analysis we explore surface anchoring of agents at the boundaries substrate drag can rectify coherent an polar fluid in 2D Upon increasing activity, succession dynamical states is obtained, from laminar vortex arrays eventual turbulence, are controlled by interplay between hydrodynamic screening length extrapolation quantifying strength orientational order parameter. We highlight key role symmetry both show with net throughput only possible for weak intermediate activity. Our work demonstrates possibility controlling nature properties channel simply patterning confining boundaries.