Simulation of Wave-Plus-Current Scour beneath Submarine Pipelines

Abstract

in combined wave-plus-current flow environments. This expression is fully-consistent with existing experimentally-based relations at both pure-current and pure-wave limits, and is

Experimental and numerical study of wave-induced backfilling beneath submarine pipelines

“…For this purpose, we aim to simplify the experimental backfilling process to an elementary two-stage process: (1) initial scour induced by a pure current, followed by: (2) backfilling induced by pure waves. A steady current is introduced via a re-circulating pump, and is kept constant The experimental campaign has additionally been complemented with similar numerical simulations (using regular waves), based on a fully-coupled hydrodynamic and morphodynamic CFD model , extending previous pipeline scour-related applications of Fuhrman et al (2014) and Larsen et al (2016).…”

Tsunami-induced scour around monopile foundations

“…The simulations are based on a model solving Reynolds averaged Navier-Stokes (RANS) equations, fully coupled with turbulence closure, bed and suspended load sediment transport descriptions, and a seabed morphological model. The model was developed and utilized in simulating breaker bar morphology by Jacobsen et al (2014); It has been additionally been used in simulating wave induced scour beneath pipelines by Fuhrman et al (2014) and Larsen et al (2016) as well as scour around a monopile by Baykal et al (2015).…”

Numerical Investigation of the Influence of Water Jumping on the Local Scour beneath a Pipeline under Steady Flow

“…d 50 (13) where θ cro is the critical shields number for a flat bed; φ is the angle between the bed's steepest slope and the bed's shear stress direction; β is the angle between the bed and horizontal plane; µ s is the static friction coefficient; and D * is the dimensionless grain size.…”

“…Zhao et al [11] studied the effect of the distance between two pipelines on the scour hole under them. Liu [12] studied nonlinear wave-induced scour under the pipeline on a slope, and Bjarke et al [13] simulated the erosion under a pipeline under wave-current coupled conditions.…”

“…Water jumping is a common free surface phenomenon when flow meets the pipeline, while in most scour simulations [9,11,13,14], the rigid lid assumption was adopted to simplify the simulation. As for using the rigid lid assumption to replace free surface, Baykal et al [14] and Roulund et al [15] pointed out that rigid lid approximation can provide reasonable results when the Froude number is less than 0.2.…”