Počet záznamů: 1
Non-rotational coherent structures in the flow with different degree of turbulence
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SYSNO ASEP 0480033 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV Záznam nebyl označen do RIV Název Non-rotational coherent structures in the flow with different degree of turbulence Tvůrce(i) Kellnerová, Radka (UT-L) RID, ORCID
Jurčáková, Klára (UT-L) RID, ORCID
Nosek, Štěpán (UT-L) RID, ORCID
Jaňour, Zbyněk (UT-L) RID, ORCIDForma vydání Online - E Akce Symposium on Boundary Layers and Turbulence /22./ Datum konání 20.06.2016 - 24.06.2016 Místo konání Salt Lake City Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Klíč. slova coherent structure ; turbulence ; PIV ; correlation ; quadrant analysis Vědní obor RIV DG - Vědy o atmosféře, meteorologie CEP GA15-18964S GA ČR - Grantová agentura ČR Institucionální podpora UT-L - RVO:61388998 Anotace The coherent structures are not satisfactorily defined for a very complex atmospheric flow. The features with a rotational motion, namely the vortices and hairpins, are mostly considered as a typical coherent pattern. In the turbulent flow, however, the non-rotational transient phenomenon may play a crucial role. The boundary layer dynamics above surfaces of various roughness was measured in the wind-channel by 2D 2C TR-PIV. The data recorded with the high sampling frequency were analysed by means of coherence detection methods. Firstly, the spatial correlation of the longitudinal and vertical velocity component is calculated and a tilt angle of the area with significant correlation coefficient is retrieved. Secondly, the Quadrant analyses applied to the momentum flux at each snapshot revealed that the spatially compact regions of the uniform sweep and ejection events contained up to 80% of the total momentum flux. 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 2018
Počet záznamů: 1