  A hydrodynamic interaction between an old supernova remnant and a massive
black hole is studied with the help of a high-resolution adaptive mesh
refinement code. A series of multidimensional numerical models is obtained for
a fixed distance between supernova explosion site and the black hole but
different densities of the ambient medium. The interaction between the shell of
the supernova remnant and the black hole results in a rapid increase of the
emission from the vicinity of the black hole. Light curves of the gas heated by
gravitational compression and hydrodynamical interactions are obtained assuming
optically thin conditions. It is shown that the duration of the event and the
peak luminosity critically depend on the density of the ambient medium. The
model is applied to the data obtained by the Chandra satellite for the Galactic
center.
