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Breaking solitary waves and breaking wave forces on a vertically mounted slender cylinder over an impermeable sloping seabed

  • Mayilvahanan Alagan ChellaEmail author
  • Hans Bihs
  • Dag Myrhaug
  • Michael Muskulus
Research Article

Abstract

In the present study, breaking solitary waves over a sloping seabed and breaking wave forces on a vertically mounted cylinder are simulated with the three-dimensional CFD model REEF3D. The numerical model uses the Reynolds-Averaged Navier–Stokes (RANS) equations together with the level set method (LSM) for the free surface and the \(k-\omega \) for the turbulence. The numerical model is validated for simulating breaking solitary waves and breaking wave forces against the experimentally measured free surface profiles and vertical and horizontal velocities by Mo et al. (Ocean Eng 74:48–60, 2013) and the experimentally measured free surface elevation and breaking wave force by Chakrabarti et al. (Appl Ocean Res 19:113–140, 1997). The main purpose of the paper is to examine the effects of the breaking characteristics, the geometric properties, the relative cylinder positions and the incident wave heights on the breaking wave force characteristics. A total of 21 simulations are performed to investigate the characteristics and the geometric properties of solitary waves breaking over a slope and the associated breaking wave forces on a cylinder. First, the characteristics and geometric properties of breaking solitary waves are investigated with two-dimensional simulations. Further, the study explores the effect of the relative distance between the breaking point and the cylinder on breaking wave forces. Finally, the study examines breaking solitary wave forces for different incident waves. This also includes the analysis of breaking wave force characteristics such as the impact duration and rise time, the peak force, the average slamming coefficient and the force impulse. The results of the numerical simulations show that the relative distance between the cylinder and the breaking point plays an important role in obtaining the maximum force. In addition, the numerical model is capable of representing the most important physical flow features related to the breaking solitary waves and the interaction with the vertical slender cylinder.

Keywords

Solitary waves Wave structure interaction Breaking waves Geometric properties Breaking characteristics Breaking wave forces 

Notes

Acknowledgments

The authors wish to thank Prof. Atle Jansen and Prof. Phillip L.-F. Liu for providing the experimental data. The research for this paper was supported by the Norwegian Research Center for Offshore Wind Technology (NOWITECH), Research council of Norway (Contract No.193823). The authors also wish to thank NOTUR (Project No. NN9240K) for the allocation of computational resources provided on the Vilje system at the super computing facilities at NTNU.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Department of Civil and Transport EngineeringNorwegian University of Science and TechnologyTrondheimNorway
  2. 2.Department of Marine TechnologyNorwegian University of Science and TechnologyTrondheimNorway

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