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research-article

CFD Simulations of Regular and Irregular Waves Past a Horizontal Semi-submerged Cylinder

[+] Author and Article Information
Shengnan Liu

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

Muk Chen Ong

Department of Mechanical and Structural, Engineering and Materials Science, University of Stavanger, Stavanger, Norway
muk.c.ong@uis.no

Charlotte Obhrai

Department of Mechanical and Structural, Engineering and Materials Science, University of Stavanger, Stavanger, Norway
charlotte.obhrai@uis.no

Sopheak Seng

Research department, Bureau Veritas, Neuilly-sur-Seine, France
sopheak.seng@bureauveritas.com

1Corresponding author.

ASME doi:10.1115/1.4038349 History: Received June 04, 2017; Revised October 24, 2017

Abstract

Two-dimensional (2D) numerical simulations have been performed to investigate both regular and irregular waves past a fixed horizontally semi-submerged circular cylinder. The 2D simulations are carried out by solving Navier-Stokes equations discretized by finite volume method (FVM). Volume of fluid (VOF) method is employed to capture the free surface in the numerical wave tank. Validation studies have been performed by comparing the numerical results of free surface waves past the cylinder with the published experimental and numerical data. The present numerical results are in good agreement with both the experimental and the other numerical results in terms of hydrodynamic forces and free surface elevation. Subsequently, the effects of the wave height and the wave length on wave-structure interaction are investigated by conducting numerical simulations on the regular and the irregular waves past a semi-submerged cylinder at different wave heights and the wave lengths. The averaged and maximum vertical wave forces on the cylinder increase with the increasing wave height. The numerical results for the irregular waves are compared with those induced by the regular waves in terms of the maximum and averaged vertical wave forces. When the significant wave height and the spectral peak period of the irregular waves is equal to the wave height and the wave period of the regular waves, the maximum vertical wave force induced by the irregular waves is larger than that induced by the regular waves, meanwhile the average vertical wave forces have the contrary relationship.

Copyright (c) 2017 by ASME
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