Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-18
Astrophys.J. 576 (2002) 832-848
Astronomy and Astrophysics
Astrophysics
Submitted to the Astrophysical Journal; for additional information, higher quality images, and simulation animations see htt
Scientific paper
10.1086/341886
Many astrophysical flows occur in inhomogeneous (clumpy) media. We present results of a numerical study of steady, planar shocks interacting with a system of embedded cylindrical clouds. Our study uses a two-dimensional geometry. Our numerical code uses an adaptive mesh refinement allowing us to achieve sufficiently high resolution both at the largest and the smallest scales. We neglect any radiative losses, heat conduction, and gravitational forces. Detailed analysis of the simulations shows that interaction of embedded inhomogeneities with the shock/postshock wind depends primarily on the thickness of the cloud layer and arrangement of the clouds in the layer. The total cloud mass and the total number of individual clouds is not a significant factor. We define two classes of cloud distributions: thin and thick layers. We define the critical cloud separation along the direction of the flow and perpendicular to it distinguishing between the interacting and noninteracting regimes of cloud evolution. Finally we discuss mass-loading and mixing in such systems.
Blackman Eric G.
Frank Alejandro
Poludnenko Alexei Y.
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