Reducing drag and oscillation of spheres used for buoyancy in oceanographic moorings

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DOIResolve DOI: http://doi.org/10.1175/2006JTECHO472.1
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TypeArticle
Journal titleJournal of Atmospheric and Oceanic Technology
Volume25
Issue10
Pages18231833; # of pages: 11
AbstractNumerical and laboratory results of the drag characteristics are presented for different configurations of an underwater buoyancy package. It is shown that the drag and oscillation of an underwater sphere can be reduced substantially with the addition of a shaped cowling. The influence of several different cowling shapes on the drag and lift are determined. The results from a numerical fluid dynamical calculation are compared and laboratory measurements are scaled. Both the dynamic and static components of drag and lift are presented. The drag force for an underwater sphere can be reduced by more than 80% for a full teardrop-shaped cowling. A truncated teardrop, more practical for real applications, will still reduce the drag by 60%?70%. In addition to the drag, the amplitude of oscillations driven by eddy shedding is similarly reduced.
Publication date
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedYes
IdentifierIR-2005-28
NRC number6292
NPARC number8895099
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Record identifier798c749d-b4f9-4436-ae70-04c142cf5937
Record created2009-04-22
Record modified2016-05-09
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