期刊
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
卷 170, 期 -, 页码 238-255出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jweia.2017.08.001
关键词
CFD simulations; Urban wind flow; Model detailing; Geometric uncertainties; Statistical performance
资金
- European Cross-border Programme Italy/France [CUP: B87E09000000007, CUP: B82F13000100005]
- Compagnia di San Paolo [ROL: 9820]
Wind flow in urban areas is strongly affected by the urban geometry. In the last decades most of the geometries used to reproduce urban areas, both in wind-tunnel (WT) tests and Computational Fluid Dynamics (CFD) simulations, were simplified compared to reality in order to limit experimental effort and computational costs. However, it is unclear to which extent these geometrical simplifications can affect the reliability of the numerical and experimental results. The goal of this paper is to quantify the deviations caused by geometrical simplificadons. The case under study is the district of Livorno city (Italy), called Quartiere La Venezia. The 3D steady Reynolds-averaged Navier-Stokes (RANS) simulations are solved, first for a single block of the district, then for the whole district. The CFD simulations are validated with WT tests at scale 1:300. Comparisons are made of mean wind velocity profiles between WT tests and CFD simulations, and the agreement is quantified using four validation metrics (FB, NMSE, R and FAC1.3). The results show that the most detailed geometry provides improved performance, especially for wind direction alpha = 240 degrees (22% difference in terms of FAC1.3).
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