  We investigate the dynamics of fast neutrino flavor conversions (FFCs) in the
one-dimensional (1D) inhomogeneous and the homogeneous models as post processes
by employing snapshots obtained by our self-consistent, realistic Boltzmann
simulations in two spatial dimensions (2D). We show that the FFC growth rate is
considerably larger in the inhomogeneous model than in the homogeneous model,
as expected from the previous linear analysis results. We find that the
momentum space dimension does not significantly influence the neutrino
transition probability under inhomogeneous conditions. On the other hand, in
the homogeneous model without collisions, the FFC depends on the momentum
space, and the azimuthal angle dependence breaks the periodicity of the FFC.
Our study demonstrates that collision-induced enhancement occurs on a long time
scale in the inhomogeneous model. Despite that collision-induced enhancement
does not appear on the short time scale, that should be taken into account to
predict the final conversion probability.
