On modelling CC85 wind in an expanding local box

Abstract

The Chevalier & Clegg (1985) spherical wind is widely used to model galactic outflows. Efforts are underway to understand the production of multiphase gas in such outflows. Since the important scales for the multiphase gas are very small compared to the size of the wind, it is very useful to have a local model of the cold gas interacting with a volume-filling expanding wind. In this note we explicitly derive the governing hydrodynamic equations in such a local box for the first time. We highlight that the expansion in a wind occurs only in the transverse direction, and this results in anisotropic source terms in the momentum equation. Our equations will be very useful in realistic modelling of the small scale structure of multiphase galactic outflows. [original note does not include an abstract]

arXiv comment4 pages, 1 figure; corrected minor typo in Eqs. 10a,b

References in corpus (5)

• The growth and entrainment of cold gas in a hot wind
• Magnetized Gas Clouds can Survive Acceleration by a Hot Wind
• In a hot bubble: why does superbubble feedback work, but isolated supernovae do not?
• The Magnetohydrodynamics of Shock-Cloud Interaction in Three Dimensions
• The Production of Cold Gas Within Galaxy Outflows

Cited by in corpus (5)

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• Fading in the Flow: Suppression of cold gas growth in expanding galactic outflows
• Multi-cloud crushing -- the collective survival of cold clouds in galactic outflows