Turbulent shear layers in confining channels

We present a simple model for the development of shear layers between parallel flows in confining channels. Such flows are important across a wide range of topics from diffusers, nozzles and ducts to urban air flow and geophysical fluid dynamics. The model approximates the flow in the shear layer as...

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Bibliographic Details
Published inarXiv.org
Main Authors Benham, G P, Castrejon-Pita, A A, Hewitt, I J, Please, C P, Style, R W, Bird, P
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 06.04.2018
Subjects
Aerodynamics
Air flow
Channels
Computational fluid dynamics
Confining
Diffusers
Ducts
Fluid flow
Geophysical fluids
Geophysics
Inflow
Nozzles
Physics - Fluid Dynamics
Pressure recovery
Shear layers
Turbulence
Velocimetry
Velocity measurement
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Summary:We present a simple model for the development of shear layers between parallel flows in confining channels. Such flows are important across a wide range of topics from diffusers, nozzles and ducts to urban air flow and geophysical fluid dynamics. The model approximates the flow in the shear layer as a linear profile separating uniform-velocity streams. Both the channel geometry and wall drag affect the development of the flow. The model shows good agreement with both particle-image-velocimetry experiments and computational turbulence modelling. The low computational cost of the model allows it to be used for design purposes, which we demonstrate by investigating optimal pressure recovery in diffusers with non-uniform inflow.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.01046