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research-article

Numerical Simulations of Breaking Waves and Steep Waves past a Vertical Cylinder at Different KC Numbers

[+] Author and Article Information
Shengnan Liu

PhD candidate, Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway, 4021
shengnan.liu@uis.no

Muk Chen Ong

Professor, University of Stavanger, Stavanger, Norway, 4021
muk.c.ong@uis.no

Charlotte Obhrai

Associate professor, University of Stavanger, Stavanger, Norway, 4021
charlotte.obhrai@uis.no

1Corresponding author.

ASME doi:10.1115/1.4043278 History: Received March 31, 2018; Revised March 18, 2019

Abstract

A 3D numerical two-phase flow model based on solving Unsteady Reynolds-averaged Navier-Stokes (URANS) equations has been used to simulate spilling breaking waves and steep waves past a monopile structure on a 1:10 slope. The volume of fluid (VOF) method is employed to capture the free surface and the k-w Shear-Stress Transport (k-w SST) turbulence model is used to simulate the turbulence effects. Mesh and time-step refinement studies have been conducted. The numerical results of wave forces on the structure are compared with the experimental data from Irschik et al. (2004) to validate the numerical model, and the numerical results are in good agreement with the measured data. The wave forces on the structure at different KC numbers are discussed in terms of the generation of the slamming force. The secondary load cycles are observed after the wave front past the structure. The dynamic pressure and velocity distribution, as well as the characteristics of the vortices around the structure at four important time instants, are studied.

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