Two-Phase Flow Simulation of Tunnel and Lee-Wake Erosion of Scour below a Submarine Pipeline
Résumé
This paper presents a numerical investigation of the scour phenomenon around a submarine
pipeline. The numerical simulations are performed using SedFoam, a two-phase flow model
for sediment transport implemented in the open source Computational Fluid Dynamics (CFD) toolbox
OpenFOAM. The paper focuses on the sensitivity of the granular stress model and the turbulence
model with respect to the predictive capability of the two-phase flow model. The quality of the
simulation results is estimated using a statistical estimator: the Brier Skill Score. The numerical results
show no sensitivity to the granular stress model. However, the results strongly depend on the choice
of the turbulence model, especially through the different implementations of the cross-diffusion
term in the dissipation equation between the k − ε and the k − ω2006 models. The influence of the
cross-diffusion term tends to indicate that the sediment transport layer