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research-article

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

[+] Author and Article Information
Mayilvahanan Alagan Chella

Postdoctoral Researcher, Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, 7491 Norway
mayilvahanan.alaganchella@gmail.com

Hans Bihs

Associate Professor, Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, 7491 Norway
hans.bihs@ntnu.no

Dag Myrhaug

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

Øivind Asgeir Arntsen

Associate Professor, Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, 7491 Norway
oivind.arntsen@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4042265 History: Received July 17, 2017; Revised December 02, 2018

Abstract

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 CFD model REEF3D. The model is based on the Reynolds-Averaged Navier-Stokes (RANS) equations coupled with the level set method (LSM) and k-w turbulence model. Three wave impact conditions are considered in the present 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.

Copyright (c) 2018 by ASME
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