  We study the onset and characteristics of vortices in complex (dusty) plasmas
using two-dimensional simulations in a setup modeled after the PK-3 Plus
laboratory. A small number of microparticles initially self-arranges in a
monolayer around the void. As additional particles are introduced, an extended
system of vortices develops due to a non-zero curl of the plasma forces. We
demonstrate a shear-thinning effect in the vortices. Velocity structure
functions and the energy and enstrophy spectra show that vortex flow turbulence
is present that is in essence of the "classical" Kolmogorov type.
