  We study the far-from-equilibrium dynamics of a (2+1)-dimensional superfluid
at finite temperature and chemical potential using its holographic description
in terms of a gravitational system in 3+1 dimensions. Starting from various
initial conditions corresponding to ensembles of vortex defects we numerically
evolve the system to long times. At intermediate times the system exhibits
Kolmogorov scaling the emergence of which depends on the choice of initial
conditions. We further observe a universal late-time regime in which the
occupation spectrum and different length scales of the superfluid exhibit
scaling behaviour. We study these scaling laws in view of superfluid turbulence
and interpret the universal late-time regime as a non-thermal fixed point of
the dynamical evolution. In the holographic superfluid the non-thermal fixed
point can be understood as a stationary point of the classical equations of
motion of the dual gravitational description.
