Numerical and Experimental Study of Offshore Pipeline Stability in Trench
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 128, Issue 6
Abstract
Offshore pipelines are to be stabilized against external loading caused mainly by wave and currents. When pipelines are placed in a trench, the forces acting on them are reduced considerably. To investigate the stability in various trench sections, the flow over the pipeline is numerically simulated and compared with experimental results obtained from particle image velocimetry measurement. This paper consists of two parts: single pipe and dual pipe in various trench sections. Each part compares numerical results with experimental results, which include mean flow pattern, drag-force coefficient, and lift-force coefficient. For a single pipe, Smagainsky’s eddy viscosity model combined with a truncated deductive model is applied to represent the stress field in a quadrilateral structured grid system. In the numerical simulation for dual pipes, the Navier-Stokes equation and elliptic mesh generation method are used. The stability of various trench conditions is addressed in terms of mean amplitudes of oscillating lift and drag and reduction factors for each case. The results can be effectively applied to pipeline design.
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References
Garrison, C. J. (1980). “A review of drag and inertia forces on circular cylinders.” Offshore Technology Conf., 205–218.
Germano, M., Piomelli, U., Moin, P., and Cabot, W. H.(1990). “A dynamic subgrid scale eddy viscosity model.” Phys. Fluids A, 3, 1760–1765.
Hayder, M. E., and Turkel, E.(1995). “Nonreflecting boundary conditions for jet flow computations.” AIAA J., 33(12), 2264–2270.
Jo, C. H., Kim, K. S., and Hong, S. G. (2000). “Subsea pipeline in various trench sections.” Int. Offshore and Polar Engineering Conf., International Society of Offshore and Polar Engineers, Vol. II, 218–225.
Jo, C. H., Min, K. H., and Shin, Y. S. (2001). “Dual offshore pipeline stability in trench.” Int. Offshore and Polar Engineering Conf., International Society of Offshore and Polar Engineers, Vol. II, 173–179.
Jordan, S. A., and Ragab, S. A.(1998). “A large-eddy simulation of the near wake of a circular cylinder.” J. Fluids Eng., 120, 243–252.
Knoll, D. A., and Herbich, J. B. (1980). “Wave and current forces on a submerged offshore pipeline,” Offshore Technology Conf., 227–234.
Lee, S., Jo, C. H., Jang, S. W., and Hong, S. G. (2001). “Numerical comparison of stability and flow pattern over offshore pipeline in trench.” Int. Offshore and Polar Engineering Conf., International Society of Offshore and Polar Engineers, Vol. II, 68–75.
Rados, K. G., and Pitt, D. (2000). “On the interaction of pipe lines on the seabed.” Int. Offshore and Polar Engineering Conf., International Society of Offshore and Polar Engineers, Vol. II, 155–161.
Runchal, A. K.(1987). “CONDIF: A modified central-difference scheme for convective flows.” Int. J. Numer. Methods Eng., 24, 1593–1608.
Runchal, A. K., and Bhatia, S. K. (1993). “ASME benchmark study: ANSWER predictions for backward facing step and lid-driven cubical cavity.” ASME FED, Vol. 160, American Society of Mechanical Engineers, Washington, D.C., 43–54.
Smagorinsky, J.(1963). “General circulation experiments with the primitive equations. Part I: the Basic Experiment.” Mon. Weather Rev., 91, 99–164.
Sumer, B. M., and Fredsoe J. (1997). “Hydrodynamics around circular structures.” Advanced Series on Ocean Engineering 12, P. L.-F. Liu, ed., World Scientific, Singapore.
Tracy, M. B., and Plentovich, E. B. (1997). “Cavity unsteady-pressure measurements at subsonic and transonic speeds.” NASA Tech. Paper 3669, NASA Langley Research Center, Hampton, Va.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 128 • Issue 6 • November 2002
Pages: 258 - 270
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Sep 28, 2001
Accepted: May 28, 2002
Published online: Oct 15, 2002
Published in print: Nov 2002
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