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Drag on a sphere moving horizontally through a stratified liquid

Published online by Cambridge University Press:  20 April 2006

Karl E. B. Lofquist  and
L. Patrick Purtell
Karl E. B. Lofquist
Affiliation:
National Bureau of Standards, Gaithersburg, MD 20899
L. Patrick Purtell
Affiliation:
National Bureau of Standards, Gaithersburg, MD 20899
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Abstract

The drag on a sphere moving horizontally through stably stratified salt water is measured in laboratory experiments. The increment ΔCD in drag coefficient due to the stratification is obtained as a function of a stratification parameter κ and, in principle, the usual Reynolds number R. In these experiments, where R ranges from 150 to 5000, ΔCD is insensitive to R. But, as a function of κ, ΔCD has both positive and negative values attributable respectively to lee-wave drag and to suppression of turbulence in the wake. An observed delay in flow separation also apparently results from the lee-wave drag.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 148 , November 1984 , pp. 271 - 284
Copyright
© 1984 Cambridge University Press

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