Počet záznamů: 1
Recent Advances in Urban Ventilation Assessment and Flow Modelling
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SYSNO ASEP 0508559 Druh ASEP M - Kapitola v monografii Zařazení RIV C - Kapitola v knize Název On Street-Canyon Flow Dynamics: Advanced Validation of LES by Time-Resolved PIV Tvůrce(i) 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, ORCIDČíslo článku 161 Zdroj.dok. Recent Advances in Urban Ventilation Assessment and Flow Modelling. - Basel : MDPI Books, 2019 / Buccolieri R. ; Hang J. - ISBN 978-3-03897-807-7 Rozsah stran s. 198-224 Poč.str. 26 s. Poč.str.knihy 448 Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova wind tunnel ; LES ; validation ; street canyon ; coherent structures Vědní obor RIV DG - Vědy o atmosféře, meteorologie Obor OECD Meteorology and atmospheric sciences CEP GA15-18964S GA ČR - Grantová agentura ČR Institucionální podpora UT-L - RVO:61388998 DOI 10.3390/atmos9050161 Anotace 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. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2020 Elektronická adresa https://www.mdpi.com/books/pdfdownload/book/1264
Počet záznamů: 1