Hydrodynamic and thermal analyses performed during the conceptual design of an
unmanned underwater vehicle are presented in this study. The hull shape is
determined by considering alternative shapes and the dimensions are determined
from the internal arrangement of components. Preliminary thermal analyses of the
watertight section are performed with a commercial software called FLUENT to
check the risk of over-heating due to the heat dissipation of devices.
Performance of the proposed hull design is analyzed by FLUENT. Before
simulations of the vehicle, validation studies are performed. Models 4159, 4158 and
4154 of Series 58 are chosen as the experimental reference. Their total resistance
coefficients are compared with the results of the validations analyses. Mesh densities,
turbulence models, near wall modeling approaches and inlet turbulence intensities
are varied to understand their effects on the accuracy of predictions. A suitable
turbulence modeling approach is chosen to analyze forward and vertical motions of
the vehicle to check whether speed requirements are fulfilled. Hull configurations
with and without appendages are used to observe their effects on total drag. It is
observed that the proposed design satisfies speed requirements of the vehicle and no
overheating is expected in the watertight section.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/2/12610754/index.pdf |
| Date | 01 July 2009 |
| Creators | Cevheri, Necmettin |
| Contributors | Aksel, Mehmet Haluk |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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