Type of Document	Master's Thesis
Author	Dewi, Jr., Fata Dwi Endyana Jr.
Author's Email Address	fatad@fng.com
URN	etd-11197-171225
Title	Three-Dimensional Analysis of Wave Attenuation by Anchored Hemicylindrical Shell
Degree	Master of Science
Department	Aerospace and Ocean Engineering
Advisory Committee	Advisor Name Title Fortune, Jimmie C. Fu, Victoria R. McDaniels, Carl O. Neu, Wayne L. Plaut, Raymond H. Liapis, Stergios I. Committee Chair
Keywords	Vibration Inflatable Breakwater Wave
Date of Defense	1997-08-27
Availability	unrestricted
Abstract The performance of a flexible structure as a breakwater is investigated numerically. The structure is a hemicylinder and is filled with water of uniform pressure. It is anchored along the sides. Only flexural modes are present. The structure is modeled as an elastic shell using the finite element program ABAQUS. The fluid is assumed to be inviscid and incompressible. The fluid flow is analyzed using a boundary integral method and the integral equation is solved numerically by a panel method. The vibration characteristics of the structure are analyzed both in the absence and presence of water. The hydrodynamic coefficients, forces, and the dynamic response of the structure in waves are obtained as a function of the wave number. Two different water depths of 5 m and 6 m are considered. For each water depth, normal and oblique incident waves are considered. The free surface elevation in front of and behind the structure is evaluated for different wave frequencies and directions. The results indicate that the flexible structure is effective in reducing the incident wave intensity over a wide range of frequencies.
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