An empirically based assessment of district-level CFD application
Başlık çevirisi mevcut değil.
- Tez No: 402328
- Danışmanlar: PROF. DR. ARDESHIR MAHDAVI
- Tez Türü: Doktora
- Konular: Mimarlık, Architecture
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2016
- Dil: İngilizce
- Üniversite: Technısche Unıversıtat Wıen
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
Recently, the microclimatic conditions in urban areas have been attracting growing attention by researchers. The incremental change of city populations along with the required construction and traffic loads have resulted in a series of environmental changes such as an increase in air temperature, solar radiation and CO2 emissions. Reducing high temperatures and contaminant dispersion have become one of the major concerns in urbanization, especially within urban canyons. Several methods are applied to analyze the current conditions and to develop solutions. In this case, Computational Fluid Dynamics (CFD) applications are applied. CFD provides whole flow field analysis and its cost effective features enhance the availability of the software. However, an urban area has a complex topology and a CFD study involves numerous variables to predict the atmospheric boundary layer flows within an urban canyon. Despite the advantages of the computational approach, CFD is not used as a standalone tool considering verification and validation issues.This research addresses unknown variables and explores predictive performance of a CFD application in urban level queries using a statistical approach. Measurements of wind speed and wind direction at 16 different locations were performed using two standard weather stations and a mobile weather station. The measurement results were aggregated and structured into 280 distinct airflow velocity values, which were subsequently compared with the respective CFD results. From this comparison, a systematic error was encountered and it was condensed using a parametrical study. Certain conclusions were derived with regard to the predictive performance of urban-level CFD applications and its dependence on the modelling assumptions and strategies. Subsequently, a simple measure to calibrate a CFD model and to achieve a better overall agreement between simulated and measured data has been proposed.
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