Speaker
C-K Chan
Description
We derive and numerically confirm that the saturation of
energy condensation in two-dimensional turbulence is
governed by the balance between forcing and small-scale
dissipation. The time scale of saturation is inversely
proportional to the viscosity but the saturation energy
level is determined by both viscosity and the forcing scale.
It is shown that, because the energy dissipation is
proportional to the enstrophy, which itself is a conserved
quantity in the ideal case, it is necessary to resolve the
enstrophy spectrum to achieve numerical consistency. We also
find that the movement of the condensate vortices can be
described as Brownian motion of an inertial particle.
[arXiv:1109.6937v1]
