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Research Papers: Ocean Engineering

Three-Dimensional Fluid-Structure-Sediment Interaction Modeling With Application to Local Scouring Around a Movable Cylinder

[+] Author and Article Information
Tomoaki Nakamura

Designated Associate Professor
Institute for Advanced Research,
Nagoya University,
Furo-cho, Chikusa-ku,
Nagoya 464-8601, Japan
e-mail: tnakamura@nagoya-u.jp

Solomon C. Yim

Professor
Fellow ASME
School of Civil and Construction Engineering,
Oregon State University,
220 Owen Hall Corvallis, OR 97331
e-mail: solomon.yim@oregonstate.edu

Norimi Mizutani

Professor
Department of Civil Engineering,
Nagoya University,
Furo-cho, Chikusa-ku,
Nagoya 464-8603, Japan
e-mail: mizutani@civil.nagoya-u.ac.jp

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 10, 2011; final manuscript received December 5, 2012; published online May 24, 2013. Assoc. Editor: Dong S. Jeng.

J. Offshore Mech. Arct. Eng 135(3), 031105 (May 24, 2013) (9 pages) Paper No: OMAE-11-1078; doi: 10.1115/1.4023797 History: Received September 10, 2011; Revised December 05, 2012

Complex multidisciplinary physical fields formed by the dynamic interaction between fluid flows, structure motion, and seabed profile evolution are natural in a marine environment. Modeling and analysis of such fluid-structure-sediment interactions are essential for predicting and analyzing the nonlinear behavior of movable structures and their surrounding sediments under wave action. However, no analytical and numerical tools which consider the detailed physics of the entire coupled fluid-structure-sediment system are currently available. In this study, a three-dimensional coupled fluid-structure-sediment interaction model is developed to provide an overarching computational framework for simulating the dynamic behavior of multidisciplinary physical systems. The model consists of an extended Navier-Stokes solver that computes incompressible viscous multiphase flow, a volume-of-fluid module that tracks air-water interface motion, an immersed boundary module that tracks structure motion, and a sediment transport module that tracks suspended sediment motion and seabed profile evolution. For validation, the model is applied to hydraulic experiments on local scouring around a movable short cylinder supported at the base. It is found that the model predicts scour patterns around the cylinder reasonably well, consistent with experimental results measured in the hydraulic experiments. In addition, the computational applicability of the model is demonstrated to predict and analyze a general complex fluid-structure-sediment interaction phenomenon in the marine environment.

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References

Figures

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Fig. 1

Typical computational domain

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Fig. 2

Artificial damping zone

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Fig. 3

Coupling procedure

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Fig. 4

Computational domain for local scouring around a movable short cylinder

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Fig. 5

Final scour depth zsf after 50 wave periods: (a) H = 0.05 m, T = 1.5 s, d50 = 0.20 mm, and (b) H = 0.03 m, T = 3.0 s, d50 = 0.12 mm

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Fig. 6

Snapshots of wave deformation around the cylinder [H = 0.05 m, T = 1.5 s, d50 = 0.20 mm, the same case as in Fig. 5(a)]: (a) during run-up, and (b) during drawdown

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Fig. 7

Snapshots of wave deformation and vortex structures (λ2 = –10) around the cylinder for large scour evolution (H = 0.05 m, T = 1.5 s, d50 = 0.10 mm): (a) t/T = 14.0, (b) t/T = 17.0, (c) t/T = 28.0, (d) t/T = 29.0, (e) t/T = 30.0, and (f) t/T = 32.0

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Fig. 8

Position and angle of the cylinder for large scour evolution (H = 0.05 m, T = 1.5 s, d50 = 0.10 mm, the same case as in Fig. 7)

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Fig. 10

Position and angle of the cylinder dropped from above the still water surface (H = 0.05 m, T = 1.5 s, d50 = 0.20 mm, the same case as in Fig. 9)

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Fig. 9

Snapshots of the behavior of the cylinder during the airdrop, impact on the water surface, sinkage, and impact on the seabed surface and the resulting response of the surrounding seabed (H = 0.05 m, T = 1.5 s, d50 = 0.20 mm): (a) t/T = 0.05, (b) t/T = 0.11, (c) t/T = 0.15, (d) t/T = 0.20, (e) t/T = 0.40, and (f) t/T = 10.0

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