  The transient acceleration which the current cosmic acceleration is not
eternal is possible by introducing the interaction between dark matter and dark
energy. If the energy transfer is from dark energy to dark matter, then it is
possible to realize the transient acceleration. We study the possibility of
transient acceleration by considering two time-dependent phenomenological
interaction forms so that the energy transfer increases as the universe
evolves. Starting from a simple and extending to a more complicated ansatz, we
obtain analytical expressions for the evolutions of the deceleration and the
various energy density parameters. We find the ranges of the parameters in the
models for a transient acceleration.
