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Research Papers: CFD and VIV

Numerical Modeling of Breaking Wave Kinematics and Wave Impact Pressures on a Vertical Slender Cylinder

[+] Author and Article Information
Mayilvahanan Alagan Chella

Department of Civil and
Environmental Engineering,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
e-mail: mayilvahanan.alaganchella@gmail.com

Hans Bihs

Department of Civil and
Environmental Engineering,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
e-mail: hans.bihs@ntnu.no

Dag Myrhaug

Professor
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
e-mail: dag.myrhaug@ntnu.no

Øivind Asgeir Arntsen

Department of Civil and
Environmental Engineering,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
e-mail: oivind.arntsen@ntnu.no

1Corresponding author.

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 17, 2017; final manuscript received December 2, 2018; published online February 15, 2019. Assoc. Editor: Yi-Hsiang Yu.

J. Offshore Mech. Arct. Eng 141(5), 051802 (Feb 15, 2019) (8 pages) Paper No: OMAE-17-1113; doi: 10.1115/1.4042265 History: Received July 17, 2017; Revised December 02, 2018

Wave loads from breaking waves on offshore wind turbine (OWT) substructures in shallow waters still remain uncertain. The interaction of breaking waves with structures is characterized by complex free surface deformations, instantaneous impact of the water mass against the structure, and consequently large wave forces on the structures. The main objective of the paper is to investigate wave impact pressures and kinematics during the interaction of breaking waves with a vertical cylinder using the open-source computational fluid dynamics (CFD) model REEF3D. The model is based on the Reynolds-averaged Navier–Stokes (RANS) equations coupled with the level set method and k–ω turbulence model. Three wave impact conditions are considered in this study. The numerically simulated free surface deformations around the cylinder during the breaking wave interaction are also presented for different wave impact conditions. For three wave impact conditions, the wave impact pressure and the horizontal and vertical components of the particle velocity are computed in front of the cylinder and analyzed. The pressure and velocity profile at their maximum values are also examined and discussed. In addition, the total force is calculated for three breaking conditions and they are correlated with the pressure and kinematics during the interaction.

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References

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Figures

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Fig. 1

A schematic sketch of three wave impact conditions: (A) When the wave breaks at the cylinder, (B) when the wave breaks before the cylinder and impacts at the wave crest level, and (C) when the wave breaks far before the cylinder and hits the cylinder at the preceding wave trough level

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Fig. 2

Computational setup for the validation case

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Fig. 3

Comparison of numerical and experimental wave surface elevation at x =0.50 m (WG 1)

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Fig. 4

Comparison of numerical and experimental wave surface elevation at x =9.78 m (WG2)

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Fig. 5

Computational domain with nonuniform grids and local grid refinement (UG-LGR)

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Fig. 6

Simulated free surface flow features with velocity magnitude (m/s) variation for wave impact condition A: (a) t = 10.20 s, (b) t = 10.25 s, and (c) t = 10.30 s

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Fig. 7

Simulated free surface flow features with velocity magnitude (m/s) variation for wave impact condition B: (a) t = 10.40 s, (b) t = 10.45 s, and (c) t = 10.50 s

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Fig. 8

Simulated free surface flow features with velocity magnitude (m/s) variation for wave impact condition C: (a) t = 10.60 s, (b) t = 10.65 s, and (c) t = 10.70 s

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Fig. 9

Distribution of wave impact pressure on the cylinder versus the normalized wave surface elevation for NUG-LGR (dx = 0.0075 m and dz = 0.006 m) for three impact conditions: A (solid line), B (dashed line), and C (dotted line)

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Fig. 10

Distribution of horizontal velocity component in front of the cylinder versus the normalized wave surface elevation for NUG-LGR (dx = 0.0075 m and dz = 0.006 m) for three impact conditions: A (solid line), B (dashed line), and C (dotted line)

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Fig. 11

Distribution of vertical velocity component in front of the cylinder versus the normalized wave surface elevation for NUG-LGR (dx = 0.0075 m and dz = 0.006 m) for three impact conditions: A (solid line), B (dashed line), and C (dotted line)

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Fig. 12

Wave impact pressure versus time for NUG-LGR (dx = 0.0075 m and dz = 0.006 m) for three impact conditions: A (solid line), B (dashed line), and C (dotted line)

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Fig. 13

Horizontal velocity component versus time for NUG-LGR (dx = 0.0075 m and dz = 0.006 m) for three impact conditions: A (solid line), B (dashed line), and C (dotted line)

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Fig. 14

Vertical velocity component versus time for NUG-LGR (dx = 0.0075 m and dz = 0.006 m) for three impact conditions: A (solid line), B (dashed line), and C (dotted line)

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Fig. 15

Breaking wave forces on the cylinder for NUG-LGR (dx = 0.0075 m and dz = 0.006 m) for three impact conditions: A (solid line), B (dashed line), and C (dotted line)

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