Eddy diffusivities in scalar transport
نویسندگان
چکیده
منابع مشابه
Mean-field diffusivities in passive scalar and magnetic transport in irrotational flows.
Certain aspects of the mean-field theory of turbulent passive scalar transport and of mean-field electrodynamics are considered with particular emphasis on aspects of compressible fluids. It is demonstrated that the total mean-field diffusivity for passive scalar transport in a compressible flow may well be smaller than the molecular diffusivity. This is in full analogy to an old finding regard...
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S. Boi,1,2 A. Mazzino,1,2,3 and P. Muratore-Ginanneschi4 1DICCA, University of Genova, Via Montallegro 1, 16145 Genova, Italy 2INFN, Genova Section, Via Dodecaneso 33, 16146 Genova, Italy 3CINFAI Consortium, Genova Section, Via Montallegro 1, 16146 Genova, Italy 4Department of Mathematics and Statistics, University of Helsinki, Gustaf Haellstroemin katu 2b, Helsinki, Finland (Received 8 Novembe...
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Standard and anomalous transport in incompressible flow is investigated using multiscale techniques. Eddy-diffusivities emerge from the multiscale analysis through the solution of an auxiliary equation. From the latter it is derived an upper bound to eddy-diffusivities, valid for both static and time-dependent flow. The auxiliary problem is solved by a perturbative expansion in powers of the Pé...
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Coarse resolution numerical ocean models must typically include a parameterisation for mesoscale turbulence. A common recipe for such parameterisations is to invoke mixing of some tracer quantity, such as potential vorticity or buoyancy. However, it is well known that eddy fluxes include large rotational components which necessarily do not lead to any mixing; eddy diffusivities diagnosed from u...
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ژورنال
عنوان ژورنال: Physics of Fluids
سال: 1995
ISSN: 1070-6631,1089-7666
DOI: 10.1063/1.868651