  We report a non-perturbative study of the effect of different type of shear
flows on the evolution of vorticity and particle density fluctuations in
interchange turbulence. For the same shear strength, the transport of density
is less reduced by streamers than by zonal flows, zonal flows leading to
oscillation death. In the inviscid limit, vorticity (density) grows (decays) as
a power law due to streamer or zonal flow, and exponentially due to the
combined effect of zonal flow and streamer with the same sign of shear. Zonal
flow and streamer with the opposite sign of shear lead to oscillation at
multiple frequencies.
