Počet záznamů: 1  

Quadrant analysis of boundary layer above pitched and flat roofs

  1. 1.
    SYSNO ASEP0343445
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JOstatní články
    NázevQuadrant analysis of boundary layer above pitched and flat roofs
    Tvůrce(i) Kellnerová, Radka (UT-L) RID
    Kukačka, Libor (UT-L) RID
    Jaňour, Zbyněk (UT-L) RID
    Celkový počet autorů3
    Zdroj.dok.Acta Technica CSAV - ISSN 0001-7043
    Roč. 54, č. 4 (2009), s. 401-413
    Poč.str.13 s.
    Jazyk dok.eng - angličtina
    Země vyd.CZ - Česká republika
    Klíč. slovastreet canyon ; flat and pitched roofs ; quadrant analysis
    Vědní obor RIVDG - Vědy o atmosféře, meteorologie
    CEZAV0Z20760514 - UT-L (2005-2011)
    AnotaceBoundary layer over two types of urban roughness in wind-tunnel is investigated. The roughness is composed from rows of street canyons with two shapes of roof— flat and pitched. Different roofs produce different internal boundary layers above canyons. A layer generated by pitched roofs, is significantly more turbulent since it provides a larger vertical variation for the wind passing above. Momentum flux and corresponding transport exhibits diverse development, extension and magnitude as well. Ventilation in streets is therefore distinct from each other. Flat roofs generate rather larger eddies in street canyon, which does not disturb the ventilation significantly. Adversely, geometry of pitched roofs enables to wind to attack on the core of recirculation zone and break it. Quadrant analysis is applied for vertical profiles and cross-sectional areas in canyons in order to detect a domination of sweep or ejection events and to find a linkage to the third moment of velocity for both cases.
    PracovištěÚstav termomechaniky
    KontaktMarie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154
    Rok sběru2011