A NUMERICAL MODEL OF THE ROUGH TURBULENT BOUNDARY LAYER IN COMBINED WAVE AND CURRENT INTERACTION

Son Huyng-Thanh, Andre Temperville

Abstract


The turbulent boundary-layer flow over flat rough beds due to a wave or a combined wave-current interaction is studied by using a simplified numerical second-order turbulence model. The model results are compared with many sets of experimental data. Excellent predictions for ensemble-averaged velocities and favourable predictions for turbulence quantities are obtained. Variations of kinematic and dynamic characteristics of boundary-layer flow with wave, current and bed roughness parameters are determined. The model is also modified to simulate the oscillatory turbulent flow over rippled beds. The mean velocity field and the distribution of time-averaged turbulence quantities are calculated. The validity of the model is verified through comparison with experimental results. The performance and the limitation of the model are discussed.

Keywords


numerical model; turbulent boundary layer; wave/current interaction

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