Interaction of a large three-dimensional body with waves and currents by THOBEM /
The effects of uniform steady currents (or small forward velocity) on the interaction of a large three-dimensional body with waves are investigated by a time-domain higher- order boundary element method (THOBEM). The current speed is assumed to be small so that the viscous effects and the steady wa...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739667531&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The effects of uniform steady currents (or small forward velocity) on the interaction of a large three-dimensional body with waves are investigated by a time-domain higher- order boundary element method (THOBEM). The current speed is assumed to be small so that the viscous effects and the steady wave system generated by currents are insignificant. Using regular perturbation with two small independent parameters [] and [] associated with wave slope and current velocity, respectively, the boundary value problem is decomposed into the zeroth-order steady double-body flow problem at 0([]) with a rigid-wall free surface boundary condition and the first-order unsteady wave problem with the modified free surface and body boundary conditions expanded up to 0([]). Boundary integral equations are used to solve the respective problems with Rankine sources distributed over the entire boundary surfaces. The two free surface conditions are integrated at each time step by Adams- Bashforth and Adams-Bashforth-Moulton method. The Sommerfeld/Orlanski radiation condition is numerically implemented to absorb all the wave energy at the open boundary. To solve the corner problem, discontinuous elements are used at the intersection of free surface and radiation boundaries. Using the developed numerical method, wave forces, free surface and wave run-up, mean drift forces and wave drift damping are calculated for several geometries and wide range of wave frequencies. |
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| Item Description: | Vita. "Major Subject: Ocean Engineering". |
| Physical Description: | xiii, 149 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 137-140. |