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Tests of random flight and closure models in predicting turbulent scalar transport
The dispersal of contaminants in turbulent shear flows is an important concern in environmental science, meteorology and industrial processes. A number of approaches have been pursued in developing accurate means of predicting these phenomena, including traditional closure models applied to the Reynolds averaged transport equations, random flight models and probability density Junction methods. The development of DNS techniques for simulating turbulent dispersion provides a controlled means for studying the relative merits of diffusion algorithms in settings where all of the necessary fluid mechanical properties needed to implement the diffusion-calculations are available. The objective of this work is to describe a number of such tests which have been performed for turbulent dispersion in channel flow due to uniform and line sources