Modelling of scour formation using SedFoam, continuum approach

Alaa Ghzayel,Sebastien Jarny,Anthony Beaudoin,M.A Aguirre,L.A Pugnaloni,S Luding,R Soto

doi:10.1051/epjconf/202124903038

Alaa Ghzayel, Sebastien Jarny + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/202124903038

Copy DOI

Abstract

SedFOAM is a two-phase flow solver built upon consecutive laws, based on the CFD toolbox OpenFOAM. The sediment body is considered as a continuum phase. The intergranular and fluid stresses are modeled with the dense granular flow rheology and the k–ϵ turbulent model, respectively. The model setup will be based on an experimental study on the scour due to a water jet subjected to lateral confinement. A comparison study will be made based on precise experimental data by Martino et al. (2019) that will show the advantages and defaults of SedFoam. The objective of this work is to reproduce the digging and filling cycle of the scour formation due to the water jet in a confined canal. The first numerical results show that it needs to use 3D numerical simulations because of the fluctuation of the jet direction induced by the presence of a driven flow cavity.

Highlights

Two phase flow models for sediment transport have been widely developed in the past decades, in which dynamical equations are applied on both the fluid and particles phases where the particles are considered as a continuous body within the fluid
To be able to take into account the water flow fluctuation, a 3D multi phase flow model has to be used in the sense where the flow fluctuation pattern is not observed in simple 2D numerical simulations as well as the change of the form of the mound as shown in the previous sections
The phenomena of jet flipping and formation of a cavity reversed flow and change of the mound form was observed in the 3D numerical simulations

Summary

Introduction

Two phase flow models for sediment transport have been widely developed in the past decades, in which dynamical equations are applied on both the fluid and particles phases where the particles are considered as a continuous body within the fluid. This approach enables us to take into consideration most of the physical processes such as parti- ∂α ∂t + ∂αuai ∂xi = and ∂β ∂t ∂βubi ∂xi (1). The momentum equations for the particles and fluid phases are expressed as following: cles interactions, turbulence modulation and particle interaction with another.

Objectives

Methods

Conclusion