ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
It is shown that the low Froude number wake of floating two-dimensional objects is convectively unstable. This is shown to be true for bluff objects, like a circular cylinder, and for streamlined objects, like a thin airfoil. As a result, the wake behind a floating object remains steady, even at high Reynolds numbers, characterized by a long region of recirculating flow. It is concluded that the presence of the free surface has a stabilizing effect at low Froude numbers, suppressing the unsteadiness of the wake. The structure of the dispersion relation, shows that, at low Froude numbers, a short wavelength interaction between the wake instability and ambient waves is possible in the form of a spatially growing response.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.857507
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