Numerical investigation of local scour around submerged pipeline in shoaling conditions

• Published in: Volume 2: CFD and FSI
• Main Authors: Liu, Mingming (R18787), Zhao, Ming (R16667), Lu, Lin
• Other Authors: International Conference on Ocean, Offshore and Arctic Engineering (Event place), Institute for Infrastructure Engineering (Host institution), School of Computing, Engineering and Mathematics (Host institution)
• Format: Conference Object
• Language: English
• Published: U.S., American Society of Mechanical Engineers 2018
• Subjects: XXXXXX - Unknown; scour (hydraulic engineering); computational fluid dynamics; offshore oil well drilling; underwater pipelines; Navier-Stokes equations; Arctic
• Online Access: https://doi.org/10.1115/OMAE2018-78440; http://handle.westernsydney.edu.au:8081/1959.7/uws:49367

Water waves play an important role in local scour around subsea pipelines laid on the sandy seabed, especially in shallow water regions. In this paper, a two-dimensional numerical model is employed to predict local scour around submarine pipelines under water waves in shoaling condition. The motion of water under waves is simulated by solving the Reynolds Averaged Navier-Stokes (RANS) equations. The evolution of the seabed surface near the pipeline is predicted by solving the conservation of the sediment mass, which transport in the water in the forms of bed load and suspended load. The main aim of this study is to investigate the effect of the seabed slope on the scour profiles and scour depth. To achieve this aim, numerical simulations of scour around a pipeline on a flat seabed and on a slope seabed with a slope angle of 15° are conducted for various wave conditions.