For the stability of offshore structures, such as offshore wind foundations, extreme wave conditions need to be taken into account. Waves from extreme events are critical from the design perspective. In a numerical wave tank, extreme waves can be modeled using focused waves. Here, linear waves are generated from a wave spectrum. The wave crests of the generated waves coincide at a preselected location and time. Focused wave generation is implemented in the numerical wave tank module of REEF3D, which has been extensively and successfully tested for various wave hydrodynamics and wave–structure interaction problems in particular and for free surface flows in general. The open-source computational fluid dynamics (CFD) code REEF3D solves the three-dimensional Navier–Stokes equations on a staggered Cartesian grid. Higher order numerical schemes are used for time and spatial discretization. For the interface capturing, the level set method is selected. In order to test the generated waves, the time series of the free surface elevation are compared with experimental benchmark cases. The numerically simulated free surface elevation shows good agreement with experimental data. In further computations, the impact of the focused waves on a vertical circular cylinder is investigated. A breaking focused wave is simulated and the associated kinematics is investigated. Free surface flow features during the interaction of nonbreaking focused waves with a cylinder and during the breaking process of a focused wave are also investigated along with the numerically captured free surface.
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August 2017
Research-Article
Numerical Investigation of Focused Waves and Their Interaction With a Vertical Cylinder Using REEF3D
Hans Bihs,
Hans Bihs
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: hans.bihs@ntnu.no
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: hans.bihs@ntnu.no
Search for other works by this author on:
Mayilvahanan Alagan Chella,
Mayilvahanan Alagan Chella
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Search for other works by this author on:
Arun Kamath,
Arun Kamath
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
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Øivind Asgeir Arntsen
Øivind Asgeir Arntsen
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Search for other works by this author on:
Hans Bihs
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: hans.bihs@ntnu.no
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: hans.bihs@ntnu.no
Mayilvahanan Alagan Chella
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Arun Kamath
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Øivind Asgeir Arntsen
Department of Civil and Environmental Engineering,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
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 8, 2016; final manuscript received February 21, 2017; published online May 10, 2017. Assoc. Editor: Xi-Ying Zhang.
J. Offshore Mech. Arct. Eng. Aug 2017, 139(4): 041101 (8 pages)
Published Online: May 10, 2017
Article history
Received:
July 8, 2016
Revised:
February 21, 2017
Citation
Bihs, H., Chella, M. A., Kamath, A., and Arntsen, Ø. A. (May 10, 2017). "Numerical Investigation of Focused Waves and Their Interaction With a Vertical Cylinder Using REEF3D." ASME. J. Offshore Mech. Arct. Eng. August 2017; 139(4): 041101. https://doi.org/10.1115/1.4036206
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