Počet záznamů: 1

Non-rotational coherent structures in the flow with different degree of turbulence

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, ORCID}
Forma 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