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Investigations about a scale of correlation for the relationship between urban physical dimensions and wind Cp

Jones, Phillip, Carruggi de Faria, Luciano and Alexander, Donald 2014. Investigations about a scale of correlation for the relationship between urban physical dimensions and wind Cp. Presented at: 30th International Plea Conference, Ahmedabad, India, 16 -18 December 2014.

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Abstract

This paper presents the results of an investigation focused on a scale for predicting the potential for naturally ventilate buildings in the urban environment. This scale is based on the Pearson r model of correlation coefficients between urban physical dimensions with the resulting wind-driven pressure coefficients (Cp). Numerical simulations using computational fluid dynamics (CFD) were performed to a large number of urban prototypes with simplified volumetric shape. These urban prototypes were originally based on ratios of actual urban areas. The systematic variation of the volumetric urban aspect ratio of these prototypes and the simulation for three wind directions allowed finding the relationship between the urban fabric and the ∆Cp. The range in the urban prototype shapes covered as many types of urban fabric as possible, from high to low density, from low building centres to downtown skyscraper areas. Eventually, two actual urban areas and buildings, the Cardiff University Cathays Campus, in Cardiff- Wales, and the Paulista Avenue, in São Paulo- Brazil, were also simulated and contrasted to the urban prototypes scale. A relationship was found between the urban aspect ratios and the ΔCp results. This was demonstrated by statistical methods using the data on the variables concerned, thus verifying the strength of the correlation between them. Strong correlation was found between the investigations into similar scenarios of the urban prototypes and the two case studies as regards both the aspect ratios and the ΔCp results. On the other hand, low correlation for the same variables was identified when contrasting dissimilar urban prototype scenarios. KEY WORDS urban environment; aspect ratio; wind pressure; cfd; k-e; and Cp.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Unpublished
Schools: Architecture
Subjects: Q Science > Q Science (General)
Related URLs:
Last Modified: 04 Jun 2017 07:51
URI: http://orca.cf.ac.uk/id/eprint/68764

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