Numerical Simulation of Turbulent Jet Scour through Implementation of a Single Phase Eulerian Model

Abstract

Particle transport by fluid is probably one of the most difficult and involved subjects among fluid dynamics, with many important issues in this field still to be fully understood. The main purpose in this work was to advance the capabilities of the computational fluid dynamics (CFD) code caffa3d so to include effective numerical modeling of particle transport by turbulent fluid flow. An Eulerian mixture model was selected wherein particles are not addressed individually but rather as a whole, incorporating their effect by means of an effective local viscosity. Numerical simulation of local scour caused by a vertical impinging jet on a sand sediment bed was carried out. The nozzle velocity value were changed in order to analyze the influence of the erosion parameter in the equilibrium erosion value. The influence of internal friction angle and porosity were also analyzed. The results achieved show that the model adequately represents the different physical processes that drive the evolution of the fluid–particle mixture, reaching a good quantitative match with the results previously reported in the bibliography.