Hydrodynamics of Clumpy Flows: Application to the PNe

Many astrophysical flows occur in inhomogeneous media. We present results of a hydrodynamic numerical study of the interaction of a steady, planar shock/supersonic postshock flow with a system of embedded cylindrical clouds in a two-dimensional geometry and describe an analytical model of the evolution of such systems. Finally we discuss mass-loading in such systems and the applicability of the results to the planetary nebulae (PNe). The most recent results and animations of the numerical experiments described in this paper can be found at www.pas.rochester.edu/~wma .