  We study the neutrino flavor evolution in the neutrino-driven wind from a
binary neutron star merger remnant consisting of a massive neutron star
surrounded by an accretion disk. With the neutrino emission characteristics and
the hydrodynamical profile of the remnant consistently extracted from a
three-dimensional simulation, we compute the flavor evolution by taking into
account neutrino coherent forward scattering off ordinary matter and neutrinos
themselves. We employ a "single-trajectory" approach to investigate the
dependence of the flavor evolution on the neutrino emission location and angle.
We also show that the flavor conversion in the merger remnant can affect the
(anti-)neutrino absorption rates on free nucleons and may thus impact the
$r$-process nucleosynthesis in the wind. We discuss the sensitivity of such
results on the change of neutrino emission characteristics, also from different
neutron star merger simulations.
