Abstract
The flows over sand-ripples induced by wave action are characterized by the periodic flow separation and the vortex formation. In order to calculate such flows, a linearization is proposed to emphasize a convective acceleration effect of the flow. A new boundary condition which provides a vorticity supply from a boundary is introduced instead of a non-slip condition.
It was confirmed through experiments and trial-and-error calculations that the value of turbulent kinematic viscosity was twenty-five times that of kinematic viscosity ; and it was also shown that the proposed model gives good results.
