The accurate determination of hydrodynamic loads on moving ships is important for hull
form design and optimization and structural design purposes. This is especially true at the
preliminary design stage during which time quick predictions of the forces and moments
acting on a ship advancing steadily with, and without, yaw would be extremely useful. In
view of this, simple numerical cross-flow algorithms has been developed. The numerical
procedures are based on slender body theory, which is used to convert the three
dimensional problem into a series of two dimensional wavemaker problems in the plane of
transverse sections, marching in small steps from the bow section towards the stem.
Fluid density stratification, vortex shedding, finite water depth and nonlinear free
surface effects can be allowed for in the algorithms. A procedure for handling density
stratified flow has been developed and successfully used for the calculation of surface and
interfacial waves created by a prolate spheroid. Vortex shedding is modelled using the
discrete vortex method. A hybridization of the discrete vortex and boundary element
methods is achieved and illustrated in a test case of predicting the forces acting on an
oscillating flat plate.
The wavemaker, with the fully nonlinear free surface conditions, is used for
calculating the generated wave pattern and wavemaking resistance of a Wigley hull. The
effects of finite water depth on wavemaking resistance are calculated. The hybrid
boundary element-discrete vortex method is used for determining the hydrodynamic forces
and moments acting on a yawed Wigley hull.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/7135 |
| Date | 11 1900 |
| Creators | Wong, Haw L. |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Relation | UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/] |
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