A Numerical Study on the Structure and Dynamics of Turbulence in Oscillatory Bottom Layer Flow over A Flat or Rippled Bed

摘要

This paper is mainly concerned with the turbulence in oscillatory bottom boundary layers over flat or rippled seabeds.Owing to the strong shear and anisotropy of oscillatory flow,an anisotropic turbulence mathematical model is set up using the finite difference method,and the computational results of the model are verified by comparisons with well-known experiments.Turbulent energy,dissipation and Reynolds stress can all be computed with this mathematical mod-el,and the development processes of a large coherent vortex structure over a rippled bed,such as main flow separation,coherent vortex formation and curling,coherent vortex ejection and breaking up,are successfully simulated.