Results 171 to 180 of about 669 (217)

Scour below Pipelines in Waves

Journal of Waterway, Port, Coastal, and Ocean Engineering, 1990
This paper presents the results of an experimental investigation on scour below pipelines exposed to waves.
B. Mutiu Sumer, Jørgen Fredsøe
openaire   +1 more source

Scouring Below Pipelines: The Role of Vorticity and Turbulence

ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 2, Fora, 2010
A numerical study on the turbulence and vorticity of local scour underneath an offshore pipeline placed on a non-cohesive sandy seabed and forced by a steady flow current is presented. The numerical model solves the Navier-Stokes equations using an innovative Level Set technique.
Mattioli Matteo, Mancinelli Alessandro, Colicchio Giuseppina, Brocchini Maurizio   +3 more
openaire   +2 more sources

Response of Marine Pipelines in Scour Trenches

Journal of Waterway, Port, Coastal, and Ocean Engineering, 1989
This paper reviews the results of a model test study with the aim of determining the hydroelastic vibrations of a marine pipeline placed in the vicinity of a scoured trench and exposed to regular and irregular waves. The so‐called carriage technique was used in the study.
B. Mutlu Sumer, Jørgen Fredsøe, Helge Gravesen, Roberto Bruschi   +3 more
openaire   +1 more source

Three-Dimensional Scour Below Pipelines

Journal of Offshore Mechanics and Arctic Engineering, 1988
Abstract This paper deals with the scour below pipelines exposed to a current. In a typical field situation, the scour pattern along a pipeline is not uniform; the scour holes are interrupted with the reaches where the pipeline is partially or totally buried. This paper focuses on the longitudinal extent of the individual scour holes.
J. Fredsøe, E. A. Hansen, Y. Mao, B. M. Sumer   +3 more
openaire   +1 more source

A Review on Scour Modeling below Pipelines

Pipelines 2009, 2009
Local scour below pipelines commonly occurs due to the erosive action of currents and waves. Such scour may cause pipeline suspension and ultimately leads to pipeline failure. Over the last three decades, both physical and numerical modeling of pipeline scouring in steady currents and waves has been developed for better understanding of local scour. In
Can Chen, Jie Zhang
openaire   +1 more source

Scour below Pipeline in River Crossing

Journal of Hydraulic Engineering, 2000
An experimental research on the scour produced under a pipe exposed to a stream is reported. Experiments were performed in a rectangular laboratory channel whose bed was composed of loose granular particles of two different diameters. Pipes of four different sizes were located either on top of the bed or at varying distances above it. The accelerations
Masoud Ghodsian, Alix T. Moncada-M., Julian Aguirre-Pe   +2 more
openaire   +1 more source

Three-Dimensional Scour at Submarine Pipelines

Journal of Hydraulic Engineering, 2012
This paper presents results of an experimental study on three-dimensional scour at submarine pipelines with uniform sediment under a unidirectional current in clear-water conditions. The data show that propagation of the scour hole in the transverse direction of flow may be divided into a rapid and a slack phase of development.
Yushi Wu, Yee-Meng Chiew
openaire   +1 more source

Numerical modelling of pipeline scour under the combined action of waves and current with free-surface capturing

Coastal Engineering, 2019
Understanding the pipeline scour processes under the combined action of waves and current is essential for adequate scour protection measures. This paper presents the numerical modelling of pipeline scour under the co-directional combined action of waves
Nadeem Ahmad, Hans Bihs, Dag Myrhaug
exaly   +3 more sources

Study on the scour under submarine pipelines

2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011
Based on the theory research of the scour under submarine pipelines, some formulae about erosion-stopping velocity and erosion hole depth were set up. Besides, a vertical two-dimensional numerical model was used to simulate the time dependent local scour below submarine pipelines subject to unidirectional steady flow.
openaire   +1 more source

Effect of Spoilers on Scour at Submarine Pipelines

Journal of Hydraulic Engineering, 1992
This paper investigates the effect of a spoiler on local scour around submarine pipelines. Experiments conducted in a unidirectional flow show that the spoiler is capable of increasing both the scour depth beneath (tunnel erosion) and downstream of (lee erosion) the pipeline.
openaire   +1 more source