  Black hole accretion disks can form through the collapse of rotating massive
stars. These disks produce large numbers of neutrinos and antineutrinos of
electron flavor that can influence energetics and nucleosynthesis. Neutrinos
are produced in sufficient numbers that, after they are emitted, they can
undergo flavor transformation facilitated by the neutrino self interaction. We
show that some of the neutrino flavor transformation phenomenology for
accretion disks is similar to that of the supernova case, but also, we find the
disk geometry lends itself to different transformation behaviors. These
transformations strongly influence the nucleosynthetic outcome of disk winds.
