Turbulent and Transitional Modeling of Drag on Oceanographic Measurement Devices

被引:8
作者
Abraham, J. P. [1 ]
Gorman, J. M. [1 ]
Reseghetti, F. [2 ]
Sparrow, E. M. [3 ]
Minkowycz, W. J. [4 ]
机构
[1] Univ St Thomas, Sch Engn, 2115 Summit Aveune, St Paul, MN 55105 USA
[2] ENEA UTMAR OSS, I-19032 Pozzuolo Di Lerici, Italy
[3] Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55455 USA
[4] Univ Illinois, Dept Mech & Ind Engn, Chicago, IL 60607 USA
关键词
D O I
10.1155/2012/567864
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Computational fluid dynamic techniques have been applied to the determination of drag on oceanographic devices (expendable bathythermographs). Such devices, which are used to monitor changes in ocean heat content, provide information that is dependent on their drag coefficient. Inaccuracies in drag calculations can impact the estimation of ocean heating associated with global warming. Traditionally, ocean-heating information was based on experimental correlations which related the depth of the device to the fall time. The relation of time-depth is provided by a fall-rate equation (FRE). It is known that FRE depths are reasonably accurate for ocean environments that match the experiments from which the correlations were developed. For other situations, use of the FRE may lead to depth errors that preclude XBTs as accurate oceanographic devices. Here, a CFD approach has been taken which provides drag coefficients that are used to predict depths independent of an FRE.
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页数:8
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