Abstract
A new method of modeling free-surface effects for the calculation of open-channel flows has been developed and validation calculation has been performed. The new model is built around the well proven k-ω Low-Reynolds number turbulence model with an explicit treatment of the free-surface fluctuation and the intermittency of the large-eddy structure interacting with the free surface. Also the equations for the mean free-surface position and the fluctuation of the free surface are derived and modeled. The results are seen to agree very well with recent direct numerical simulation results as well as experimental data of higher Reynolds and Froude numbers.
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