  Hard partons which are produced copiously in nuclear collisions at the LHC,
deposit most of their energy and momentum into the surrounding quark-gluon
plasma. We show that this generates streams in the plasma and contributes
importantly to flow anisotropies. With the help of event-by-event
three-dimensional perfect hydrodynamic simulations we calculate the observable
azimuthal anisotropies of hadronic distributions and show that the proposed
mechanism is capable of generating non-negligible part of the observed signal.
Hence, it must be taken into account in quantitative studies in which one tries
to extract the values of viscosities from the comparison of simulated results
with measured data.
