  An inverse turbulent cascade in a restricted two-dimensional periodic domain
leads to the creation of condensate -- a pair of coherent system-size vortices.
We perform extensive numerical simulations of this system and carry on detailed
theoretical analysis based upon momentum and energy exchanges between the
turbulence fluctuations and the mean coherent condensate (vortices). The theory
predicts the vortex profile and amplitude which perfectly agree with the
numerical data.
