A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Numerical Study of Scour beneath Sagging Cylinders and Spheres
Offshore structures are extensively deployed to harvest marine resources. Due to the harsh marine environments and heavy-duty working conditions, the risks associated with failure due to scour are high, and the need for accurate prediction of these risks is increasing. Often, pipelines and cables are critical elements of subsea energy transportation and telecommunication and are highly susceptible to scour-induced failure. The scour around spheres is relevant to the offshore industry as a simplified three-dimensional representation of subsea structures. This paper provides a numerical study, using FLOW-3D Hydro, on the scour around on-bottom cylinders and spheres. Whereas most published research has explored scour around stationary solid objects, this paper presents numerical results on a more challenging case of scour around sagging cylinders and spheres. The model is first validated against published experimental and numerical results. The scour depth is then shown to increase with the decrease of the sagging velocity of the solid object. For sagging horizontal cylinders, the scour depth reaches a plateau of 1.1 times the cylinder diameter when the dimensionless sagging velocity is smaller than 0.094. For sagging spheres, the maximum scour depth reaches 0.37 times the sphere diameter when the dimensionless sagging velocity is reduced to 0.0103. The findings provide guidelines for future research on more complicated interactions between flow, solid objects and seabed, accounting for the deformation of infrastructure over time. ; We would like to thank the financial support from the Cambridge University Energy Interdisciplinary Research Centre (IRC), and Tsinghua – Cambridge Joint Research Initiative Fund. We are grateful to FLOW SCIENCE UK for an academic research license of FLOW-3D Hydro.
Numerical Study of Scour beneath Sagging Cylinders and Spheres
Offshore structures are extensively deployed to harvest marine resources. Due to the harsh marine environments and heavy-duty working conditions, the risks associated with failure due to scour are high, and the need for accurate prediction of these risks is increasing. Often, pipelines and cables are critical elements of subsea energy transportation and telecommunication and are highly susceptible to scour-induced failure. The scour around spheres is relevant to the offshore industry as a simplified three-dimensional representation of subsea structures. This paper provides a numerical study, using FLOW-3D Hydro, on the scour around on-bottom cylinders and spheres. Whereas most published research has explored scour around stationary solid objects, this paper presents numerical results on a more challenging case of scour around sagging cylinders and spheres. The model is first validated against published experimental and numerical results. The scour depth is then shown to increase with the decrease of the sagging velocity of the solid object. For sagging horizontal cylinders, the scour depth reaches a plateau of 1.1 times the cylinder diameter when the dimensionless sagging velocity is smaller than 0.094. For sagging spheres, the maximum scour depth reaches 0.37 times the sphere diameter when the dimensionless sagging velocity is reduced to 0.0103. The findings provide guidelines for future research on more complicated interactions between flow, solid objects and seabed, accounting for the deformation of infrastructure over time. ; We would like to thank the financial support from the Cambridge University Energy Interdisciplinary Research Centre (IRC), and Tsinghua – Cambridge Joint Research Initiative Fund. We are grateful to FLOW SCIENCE UK for an academic research license of FLOW-3D Hydro.
Numerical Study of Scour beneath Sagging Cylinders and Spheres
2024-09-01
Article (Journal)
Electronic Resource
English
DDC:
624
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