COMPUTATIONS ON TRANSPORTATIONS OF GRAVEL PARTICLES DUE TO OVERFLOWS TAKING ACCOUNT OF PARTICLE-PARTICLE AND PARTICLE-FLUID MECHANICAL INTERACTIONS

Abstract

A parallel computation method with a multiphase model was applied to the local scour and deposition of a gravel bed, consisting of about 16,700 gravel particles with a diameter of around 7 mm, caused by falling overflows over a rectangular-notch weir. In the computations, representative 26 shapes of gravel particles were modeled with tetrahedron elements and contact-detection spheres. The fluid forces acting on a gravel particle were estimated with the volume integral of the pressure and viscosity terms included in momentum equations for the multiphase field. Through the comparisons with experiments, the applicability of the present computational method was confirmed.