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Please use this identifier to cite or link to this item: http://dspace.cityu.edu.hk/handle/2031/8871
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dc.contributor.authorDuan, Guangdongen_US
dc.contributor.authorNgan, Keithen_US
dc.contributor.authorJackson, James Georgeen_US
dc.date.accessioned2017-06-30T03:12:05Z
dc.date.accessioned2017-09-19T09:20:42Z
dc.date.accessioned2019-02-12T08:42:32Z-
dc.date.available2017-06-30T03:12:05Z
dc.date.available2017-09-19T09:20:42Z
dc.date.available2019-02-12T08:42:32Z-
dc.date.issued2017-01en_US
dc.identifier.othersee2017-001en_US
dc.identifier.urihttp://144.214.8.231/handle/2031/8871-
dc.description.abstractMixing refers to the homogenization of a scalar field. Although it is an important subject in fluid dynamics, mixing has not attracted much attention in the urban air quality literature, where processes such as dispersion and ventilation have been highlighted. For certain applications (e.g. the accidental release of toxic chemicals), however, knowledge of the mixing rate is extremely useful. This work investigates the mixing of a passive scalar in a unit-aspect-ratio street canyon. Using large-eddy simulation, the mixing rate is characterised using the decay rate of the variance. The mixing is inhomogeneous and strongly influenced by the mean circulation; the evolution is qualitatively distinct within (i) the central vortex; (ii) corners excepting the upper downwind one; (iii) remaining regions. For each region, separate regimes related to advection and mixing can be discerned. Following established theoretical predictions, the mixing rates are related to the divergence of Lagrangian trajectories (Lyapunov exponent) and Peclet number. On account of the open boundary and inhomogeneous mixing, sensitivity of the scalar field to the initial conditions persists in the long-time limit.en_US
dc.rightsThis work is protected by copyright. Reproduction or distribution of the work in any format is prohibited without written permission of the copyright owner.en_US
dc.rightsAccess is restricted to CityU and other institutions for the purpose of scholarly communication.en_US
dc.titleMixing of a passive scalar in an urban-street canyonen_US
dc.typeConference posteren_US
dc.contributor.departmentSchool of Energy and Environmenten_US
dc.description.awardDuan Guangdong won the Excellent Poster Award at the 97th Annual Meeting of The American Meteorological Society, Seattle, 2017.en_US
dc.description.fulltextAward winning work is available.en_US
dc.description.supervisorDr. Ngan, Keithen_US
Appears in Collections:Student Works With External Awards 

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