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Turbulence models are reviewed, distinction being made between single-fluid, multi-fluid, probabilistic and direct-numerical- simulation models. It is argued that the multi-fluid models have been too long neglected, and that, their implications being amenable to working out with the aid of widely-accessible computer programs, it is time to give them careful attention.
Examples are presented of the implications of a two-fluid model applied to an atmospheric flow, of a four-fluid model applied to transient flame propagation, of a fourteen-fluid model applied to a turbulent Bunsen-burner flame, and of a hundred-fluid model applied to a well-stirred reactor.
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