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2009MNRAS.394.1351P - Mon. Not. R. Astron. Soc., 394, 1351-1378 (2009/April-2)
The turbulent destruction of clouds - I. A k-ε treatment of turbulence in 2D models of adiabatic shock-cloud interactions.
PITTARD J.M., FALLE S.A.E.G., HARTQUIST T.W. and DYSON J.E.
Abstract (from CDS):
Despite the above concerns, we find that cloud destruction in inviscid and k-ε models occurs at roughly the same speed when the post-shock flow is smooth and when the density contrast between the cloud and intercloud medium, χ ≲ 100. However, there are increasing and significant differences as χ increases. The k-ε models also demonstrate better convergence in resolution tests than inviscid models, a feature which is particularly useful for multiple-cloud simulations.
Clouds which are over-run by a highly turbulent post-shock environment are destroyed significantly quicker as they are subject to strong `buffeting' by the flow. The decreased lifetime and faster acceleration of the cloud material to the speed of the ambient flow leads to a reduction in the total amount of circulation (vorticity) generated in the interaction, so that the amount of vorticity may be self-limiting. Additional calculations with an inviscid code where the post-shock flow is given random, grid-scale, motions confirm the more rapid destruction of the cloud.
Our results clearly show that turbulence plays an important role in shock-cloud interactions, and that environmental turbulence adds a new dimension to the parameter space which has hitherto been studied.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): hydrodynamics - shock waves - turbulence - ISM: clouds - ISM: kinematics and dynamics - supernova remnants
Simbad objects: 13
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