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- Title
A computational method for determining XBT depths.
- Authors
Stark, J.; Gorman, J.; Hennessey, M.; Reseghetti, F.; Willis, J.; Lyman, J.; Abraham, J.
- Abstract
A new technique for determining the depth of expendable bathythermographs (XBTs) is developed. This new method combines a forward-stepping calculation which incorporates all of the forces on the XBT devices during their descent. Of particular note are drag forces which are calculated using a new drag coefficient expression. That expression, obtained entirely from computational fluid dynamic modeling, accounts for local variations in the ocean environment. Consequently, the method allows for accurate determination of depths for any local temperature environment. The results, which are entirely based on numerical simulation, are compared with an experimental descent of an LM-Sippican T-5 XBT. It is found that the calculated depths differ by less than 3% from depth estimates using the industry standard FRE. Furthermore, the differences decrease with depth. The computational model allows an investigation of the fluid patterns along the outer surface of the probe as well as in the interior channel. The simulations take account of complex flow phenomena such as laminar-turbulent transition and flow separation.
- Subjects
OCEANOGRAPHIC research; BATHYTHERMOGRAPH; COMPUTATIONAL fluid dynamics; COMPUTER simulation; OCEAN temperature
- Publication
Ocean Science Discussions, 2011, Vol 8, Issue 4, p1777
- ISSN
1812-0806
- Publication type
Article
- DOI
10.5194/osd-8-1777-2011