کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4438284 1620400 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Large-eddy simulation of approaching-flow stratification on dispersion over arrays of buildings
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Large-eddy simulation of approaching-flow stratification on dispersion over arrays of buildings
چکیده انگلیسی

The study investigates thermal stratification effects of approach flows on dispersion in urban environments. This is in some ways analogous to a well-developed non-neutral flow (e.g. through a large urban area) approaching a neighbourhood-scale urban region, where the effect of the local heat transfer was assumed less important. A generic urban-type geometry, i.e. a group of staggered cubes, was taken as the first test case. The DAPPLE site, which was about a one-km2 region near the intersection of Marylebone Road and Gloucester Place in central London, was taken as the second test case. Only weakly unstable conditions (i.e. bulk Richardson number Rb≥−0.2Rb≥−0.2) of approach flows were considered, with adiabatic boundary conditions at the ground and building surfaces. A number of numerical experiments were performed. The modelled mean concentration for Rb = −0.1 gave the best agreement with the field data at all DAPPLE stations. This suggests that stratification effects on dispersion in weakly unstable conditions (e.g. in London) are not negligible.


► Effect on flows of weakly unstable conditions is greater than that of weakly stable.
► Concentration can be one order different under different stratification conditions.
► Effect of weakly unstable stratification on dispersion is not negligible.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 71, June 2013, Pages 64–74
نویسندگان
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