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| Titel |
A computational method for determining XBT depths |
| VerfasserIn |
J. Stark, J. Gorman, M. Hennessey, F. Reseghetti, J. Willis, J. Lyman, J. Abraham, M. Borghini |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 7, no. 6 ; Nr. 7, no. 6 (2011-11-08), S.733-743 |
| Datensatznummer |
250004866
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| Publikation (Nr.) |
 copernicus.org/os-7-733-2011.pdf |
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| Zusammenfassung |
| A new technique for determining the depth of expendable bathythermographs
(XBTs) is developed. This new method uses 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 the
experiments of LM Sippican T-5 XBT probes. It is found that the calculated
depths differ by less than 3% from depth estimates using the standard
fall-rate equation (FRE). Furthermore, the differences decrease with depth.
The computational model allows an investigation of the fluid flow 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. |
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