کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6341298 1620394 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
CFD simulation of flow and dispersion around an isolated building: Effect of inhomogeneous ABL and near-wall treatment
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
CFD simulation of flow and dispersion around an isolated building: Effect of inhomogeneous ABL and near-wall treatment
چکیده انگلیسی
This paper presents a study of the effect of the inhomogeneous atmospheric boundary layer (ABL) and near-wall treatment on a computational fluid dynamics (CFD) simulation of the flow and dispersion around an isolated building. Based on a revised k−ɛ model (MMK), the effect of the inhomogeneous ABL is studied by comparing several sets of inhomogeneous inlet conditions with a homogeneous one, while the roughness-adapted standard wall functions and two-layer model are compared to examine the effect of the near-wall treatment of rough ground. Wind tunnel experimental data from previous investigations are used to validate the numerical simulations. The inhomogeneous ABL has a significant effect on the prediction of the flow and dispersion fields, depending on the percentage deviation of the incident from the inlet conditions. A decreased incident k profile results in a longer reattachment length on the roof and a larger recirculation region in the wake, which in turn produce decreased and increased nondimensional velocity and concentration fields, respectively. An increased incident U profile enlarges the reattachment lengths and raises the k field, which has a similar effect on the nondimensional velocity and concentration fields as decreased k. It is observed that the use of the two-layer model to solve the near-wall viscous sublayer clearly improves the prediction of flow and dispersion, depending on the role of the low-Reynolds-number effect of the near-wall region on the entire wall-bounded turbulent flow.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 77, October 2013, Pages 568-578
نویسندگان
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