Finescale Instabilities of the Double-Diffusive Shear Flow
Stern, Melvin E.
MetadataShow full item record
This study examines dynamics of finescale instabilities in thermohaline–shear flows. It is shown that the presence of the background diapycnal temperature and salinity fluxes due to double diffusion has a destabilizing effect on the basic current. Using linear stability analysis based on the Floquet theory for the sinusoidal basic velocity profile, the authors demonstrate that the well-known Richardson number criterion (Ri , 1/ 4) cannot be directly applied to doubly diffusive fluids. Rigorous instabilities are predicted to occur for Richardson numbers as high as—or even exceeding—unity. The inferences from the linear theory are supported by the fully nonlinear numerical simulations. Since the Richardson number in the main thermocline rarely drops below 1/ 4, whereas the observations of turbulent patches are common, the authors hypothesize that some turbulent mixing events can be attributed to the finescale instabilities associated with double diffusive processes.
The article of record as published may be found at http://dx.doi.org/10.1175/2010JPO4459.1
Showing items related by title, author, creator and subject.
Gannon, A.J.; Hobson, G.V. (2009-05);An investigation of the behavior of a transonic compressor rotor when operating close to stall is presented. The specific areas of interest are the behavior and location of lowfrequency instabilities close to stall. In ...
Nguyen, Lien K. (Monterey, California. Naval Postgraduate School, 2004-03);Inter-domain routing connects individual pieces of Internet topology, creating an integral, global data delivery infrastructure. Currently, this critical function is performed by the Border Gateway Protocol (BGP) version ...
Gunboat diplomacy in a new world order: strategic considerations for U.S. naval intervention in the twenty-first century Dunaway, William Michael (Fletcher School of Law and Diplomacy, 1991-04);With the dissolution of the Soviet Union and Warsaw Pact, the threat of global war has all but been eliminated. At the same time, the Third World is experiencing a rising tide of instability, brought about by economic and ...