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Wind tunnel measurements for dispersion modelling of vehicle wakes

Carpentieri, M, Kumar, P and Robins, A (2012) Wind tunnel measurements for dispersion modelling of vehicle wakes Atmospheric Environment, 62. 9 - 25. ISSN 1352-2310

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Wind tunnel measurements downwind of reduced scale car models have been made to study the wake regions in detail, test the usefulness of existing vehicle wake models, and draw key information needed for dispersion modelling in vehicle wakes. The experiments simulated a car moving in still air. This is achieved by (i) the experimental characterisation of the flow, turbulence and concentration fields in both the near and far wake regions, (ii) the preliminary assessment of existing wake models using the experimental database, and (iii) the comparison of previous field measurements in the wake of a real diesel car with the wind tunnel measurements. The experiments highlighted very large gradients of velocities and concentrations existing, in particular, in the near-wake. Of course, the measured fields are strongly dependent on the geometry of the modelled vehicle and a generalisation for other vehicles may prove to be difficult. The methodology applied in the present study, although improvable, could constitute a first step towards the development of mathematical parameterisations. Experimental results were also compared with the estimates from two wake models. It was found that they can adequately describe the far-wake of a vehicle in terms of velocities, but a better characterisation in terms of turbulence and pollutant dispersion is needed. Parameterised models able to predict velocity and concentrations with fine enough details at the near-wake scale do not exist.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Date : December 2012
Identification Number : 10.1016/j.atmosenv.2012.08.019
Uncontrolled Keywords : Dispersion modelling, Near and far wake, Vehicle wake dispersion, Wind tunnel measurements, Mixing processes
Related URLs :
Additional Information : NOTICE: this is the author’s version of a work that was accepted for publication in Atmospheric Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Atmospheric Environment, 62, December 2012, DOI 10.1016/j.atmosenv.2012.08.019.
Depositing User : Symplectic Elements
Date Deposited : 16 Nov 2012 12:21
Last Modified : 23 Sep 2013 19:40

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