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Recent Advances in Urban Ventilation Assessment and Flow Modelling
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SYSNO ASEP 0508559 Document Type M - Monograph Chapter R&D Document Type Monograph Chapter Title On Street-Canyon Flow Dynamics: Advanced Validation of LES by Time-Resolved PIV Author(s) Kellnerová, Radka (UT-L) RID, ORCID
Fuka, V. (CZ)
Uruba, Václav (UT-L) RID, ORCID
Jurčáková, Klára (UT-L) RID, ORCID
Nosek, Štěpán (UT-L) RID, ORCID
Chaloupecká, Hana (UT-L) RID, ORCID, SAI
Jaňour, Zbyněk (UT-L) RID, ORCIDArticle number 161 Source Title Recent Advances in Urban Ventilation Assessment and Flow Modelling. - Basel : MDPI Books, 2019 / Buccolieri R. ; Hang J. - ISBN 978-3-03897-807-7 Pages s. 198-224 Number of pages 26 s. Number of pages 448 Publication form Print - P Language eng - English Country CH - Switzerland Keywords wind tunnel ; LES ; validation ; street canyon ; coherent structures Subject RIV DG - Athmosphere Sciences, Meteorology OECD category Meteorology and atmospheric sciences R&D Projects GA15-18964S GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 DOI 10.3390/atmos9050161 Annotation The advanced statistical techniques for qualitative and quantitative validation of Large Eddy Simulation (LES) of turbulent flow within and above a two-dimensional street canyon are presented. Time-resolved data from 3D LES are compared with those obtained from time-resolved 2D Particle Image Velocimetry (PIV) measurements. We have extended a standard validation approach based solely on time-mean statistics by a novel approach based on analyses of the intermittent flow dynamics. While the standard Hit rate validation metric indicates not so good agreement between compared values of both the streamwise and vertical velocity within the canyon canopy, the Fourier, quadrant and Proper Orthogonal Decomposition (POD) analyses demonstrate very good LES prediction of highly energetic and characteristic features in the flow. Using the quadrant analysis, we demonstrated similarity between the model and the experiment with respect to the typical shape of intensive sweep and ejection events and their frequency of appearance. These findings indicate that although the mean values predicted by the LES do not meet the criteria of all the standard validation metrics, the dominant coherent structures are simulated well. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2020 Electronic address https://www.mdpi.com/books/pdfdownload/book/1264
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