Numerical study of turbulent flows over wavy boundaries

The fully developed turbulent flows over wavy boundaries are investigated by means of thek-ε model. Predicted flow characteristics over rigid wavy walls are in good agreement with the vailable experimental data. Moreover drag reduction has been found in a 2-dimensional channel with periodical wavy walls. The energy input from turbulent wind to regular waves is also studied in the paper by the same turbulence model with carefully posed boundary conditions at wind-wave interface. Better agreement has been obtained in the predication of the growth rates of wind waves as compared with the previous theoretical and numerical results.