  We study the evolution of the dark energy parameter within the scope of a
spatially non-flat and isotropic Friedmann-Robertson-Walker (FRW) model filled
with barotropic fluid and bulk viscous stresses. We have obtained cosmological
solutions which exhibit without a big rip singularity. It is concluded that in
both non-interacting and interacting cases non-flat open universe crosses the
phantom region. We find that during the evolution of the universe, the equation
of state (EoS) for dark energy $\omega_{D}$ changes from $\omega^{eff}_{D} <
-1$ to $\omega^{eff}_{D} > -1$, which is consistent with recent observations.
