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Research Papers: Piper and Riser Technology

Influence of Proximity of the Seabed on Hydrodynamic Forces on a Submarine Piggyback Pipeline Under Wave Action

[+] Author and Article Information
Xiaofei Cheng

Ph.D. Candidate
e-mail: chengxiaofei1985@163.com

Yongxue Wang

Professor
e-mail: wangyx@dlut.edu.cn

Guoyu Wang

Associate Professor
e-mail: wanggyu@dlut.edu.cn
State Key Laboratory of Coastal and Offshore Engineering,
Dalian University of Technology,
Dalian, 116024, PRC

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 24, 2011; final manuscript received March 26, 2012; published online February 25, 2013. Assoc. Editor: Antonio C. Fernandes.

J. Offshore Mech. Arct. Eng 135(2), 021701 (Feb 25, 2013) (8 pages) Paper No: OMAE-11-1068; doi: 10.1115/1.4006931 History: Received July 24, 2011; Revised March 26, 2012

Experimental investigations were mainly carried out to clarify the influence of the seabed proximity on hydrodynamic forces on a submarine piggyback pipeline under regular and irregular wave action. Nondimensional force coefficients for drag, inertia and lift on the piggyback pipeline were obtained with an equivalent diameter based on the Morison equation. The effect of the gap ratio e/D between the bottom of the large pipeline and the seabed on force coefficients of the piggyback pipeline was studied. The results indicated that the force coefficients initially decreased and then remained constant when e/D was beyond 0.5. In addition, a two-dimensional hybrid numerical model, FEM-k-ω-VOF, was applied for a numerical analysis. A comparison of numerical and experimental results showed that the calculated values of wave forces agreed well with those of the experiments and that the numerical model can be employed to predict the hydrodynamic forces on the submarine piggyback pipeline.

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Figures

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Fig. 1

Submarine piggyback pipeline

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Fig. 2

Sketch of the experimental setup

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Fig. 3

Geometry of computational domain

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Fig. 4

Computational mesh near the piggyback pipeline

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Fig. 5

Force coefficients on single pipeline for e/D = 0.25

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Fig. 6

Force coefficients on piggyback pipeline for e/D = 0.25

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Fig. 7

Comparison of force coefficients on piggyback pipeline and single pipeline for e/D = 0.25

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Fig. 8

Effect of e/D on force coefficients on piggyback pipeline

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Fig. 9

Numerical results for single pipeline for e/D = 0.22

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Fig. 10

Comparison of numerical and experimental results for piggyback pipeline for e/D = 0.25, KC = 25.1

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