The lift forces acting on a submarine composite pipeline in a wave-current coexisting field

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:55691

Li, Y C; Zhang, N C ^[1]

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1. Dalian Univ. of Technology (China). Dept. of Civil Engineering

The composite pipeline is defined as a main big pipe composed with one or several small pipes. The flow behavior around a submarine composite pipeline is more complicated than that around a single submarine pipeline. A series model test of composite pipelines in a wave-current coexisting field was conducted by the authors. Both in-line and lift forces were measured, and the resultant forces are also analyzed. The results of lift forces and resultant forces are reported in this paper. It is found that the lift force coefficients for composite pipelines are well related to the KC number. The lift force coefficients in an irregular wave-current coexisting field are smaller than those in regular wave-current coexisting field. The frequency of lift force is usually the twice or higher than the wave frequency. It is indicated by the authors` test that the resultant forces are larger than in-line forces (horizontal forces) about 10 to 20 percent. The effect of water depth was analyzed. Finally, the relationship between lift force coefficient C{sub l} and KC number, the statistical characteristics of lift and resultant forces, are given in this paper, which may be useful for practical engineering application.

• OSTI ID: 55691
• Report Number(s): CONF-940230--; ISBN 0-7918-1264-2
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
MATHEMATICAL MODELS
OFFSHORE SITES
PIPELINES
RESPONSE FUNCTIONS
WATER CURRENTS
WATER WAVES
WAVE FORCES