A computational method for determining XBT depths

J. Stark, J. Gorman, M. Hennessey, F. Reseghetti, J. Willis, J. Lyman, J. Abraham, M. Borghini

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11 Citations (Scopus)

Abstract

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. © 2011 Author(s).
Original languageEnglish
Pages (from-to)733 - 743
Number of pages11
JournalOcean Science
Volume7
Issue number6
DOIs
Publication statusPublished - 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Oceanography
  • Palaeontology

Cite this

Stark, J., Gorman, J., Hennessey, M., Reseghetti, F., Willis, J., Lyman, J., ... Borghini, M. (2011). A computational method for determining XBT depths. Ocean Science, 7(6), 733 - 743. https://doi.org/10.5194/os-7-733-2011