  We present a dark fluid model which contains the general linear equation of
state including the gravitation term. The obtained spherical symmetric Euler
equation and the continuity equation was investigated with the Sedov-type
time-dependent self-similar {\it ansatz} which is capable to describe
physically relevant diffusive and dispersive solutions. %The role of the
parameter in the equation of state is investigated. As results the space and
time dependent fluid density and radial velocity fields are presented and
analyzed. Additionally, the role of the initial velocity on the kinetic and
total energy densities of the fluid is discussed.
