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Mechanics of inhomogeneous turbulence and interfacial layers

Hunt, J.C.R.; Eames, I.; Westerweel, J.; (2006) Mechanics of inhomogeneous turbulence and interfacial layers. Journal of Fluid Mechanics , 554 pp. 499-519. 10.1017/S002211200600944X. Green open access

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Abstract

The mechanics of inhomogeneous turbulence in and adjacent to interfacial layers bounding turbulent and non-turbulent regions are analysed. Different mechanisms are identified according to the straining by the turbulent eddies in relation to the strength of the mean shear adjacent to, or across, the interfacial layer. How the turbulence is initiated and the topology of the region of turbulence are also significant factors. Specifically the cases of a layer of turbulence bounded on one, or two, sides by a uniform and/or shearing flow, and a circular region of a rotating turbulent vortex are considered and discussed. The entrainment processes at fluctuating interfaces occur both at the outer edges of turbulent shear layers, with and without free-stream turbulence (e.g. jets, wakes and boundary layers), at internal boundaries such as those at the outside of the non-turbulent core of swirling flows (e.g. the ‘eye-wall’ of a hurricane) or at the top of the viscous sublayer and roughness elements in turbulent boundary layers. Conditionally sampled data enables these concepts to be tested. These concepts lead to physically based estimates for critical modelling parameters such as eddy viscosity near interfaces, entrainment rates, maximum velocity and displacement heights.

Type:Article
Title:Mechanics of inhomogeneous turbulence and interfacial layers
Open access status:An open access version is available from UCL Discovery
DOI:10.1017/S002211200600944X
Publisher version:http://dx.doi.org/10.1017/S002211200600944X
Language:English
Additional information:Published by Cambridge University Press
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Mechanical Engineering
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Mathematics

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