Abstract
A new algebraic turbulent length scale model is developed, based on previous one-equation turbulence modelling experience in atmospheric flow and dispersion calculations. The model is applied to the neutral Ekman layer, as well as to fully-developed pipe and channel flows. For the pipe and channel flows examined the present model results can be considered as nearly equivalent to the results obtained using the standard k–ɛ model. For the neutral Ekman layer, the model predicts satisfactorily the near-neutral Cabauw friction velocities and a dependence of the drag coefficient versus Rossby number very close to that derived from published (G. N. Coleman) direct numerical simulations. The model underestimates the Cabauw cross-isobaric angles, but to a less degree than the cross-isobar angle versus Rossby dependence derived from the Coleman simulation. Finally, for the Cabauw data, with a geostrophic wind magnitude of 10 ms−1, the model predicts an eddy diffusivity distribution in good agreement with semi-empirical distributions used in current operational practice.
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Venetsanos, A.G., Bartzis, J.G. & Andronopoulos, S. One-Equation Turbulence Modelling for Atmospheric and Engineering Applications. Boundary-Layer Meteorol 113, 321–346 (2004). https://doi.org/10.1007/s10546-004-4835-4
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DOI: https://doi.org/10.1007/s10546-004-4835-4