Abstract
A numerical prediction method for local scour has been developed on the basis of the arbitrary Lagrangian-Eulerian (ALE) formulation, in which three-dimensional body-fitted coordinates (3D BFC) are regenerated for moving boundaries independently of the fluid motion. The governing equations, including transport equations for κ and ε, are discretized in a Lagrangian scheme and the convection terms are solved with third-order upwind difference. This prediction method was applied to the results of a three-dimensional local scour experiment and the sand bed profile was reasonably predicted.
