Polymer brushes are being increasingly used to tailor surface
physicochemistry for diverse applications such as wetting, adhesion of
biological objects, implantable devices and much more. Here we perform
Dissipative Particle Dynamics simulations to study the behaviour of
dense polymer brushes under flow in a slit-pore channel. We discover
that the system displays flow inversion at the brush interface for
several disconnected ranges of the imposed flow. We associate such
phenomenon to collective polymer dynamics: a wave propagating on the
brush surface. The relation between the wavelength, the amplitude and
the propagation speed of the flow-generated wave is consistent with the
solution of the Stokes equations when an imposed traveling wave is
assumed as the boundary condition (the famous Taylor's swimmer)
