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The Chevalier & Clegg (1985) spherical wind is widely used to model galacticoutflows. Efforts are underway to understand the production of multiphase gasin such outflows. Since the important scales for the multiphase gas are verysmall compared to the size of the wind, it is very useful to have a local modelof the cold gas interacting with a volume-filling expanding wind. In this notewe explicitly derive the governing hydrodynamic equations in such a local boxfor the first time. We highlight that the expansion in a wind occurs only inthe transverse direction, and this results in anisotropic source terms in themomentum equation. Our equations will be very useful in realistic modelling ofthe small scale structure of multiphase galactic outflows. [original note doesnot include an abstract]

On modelling CC85 wind in an expanding local box