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Impact of Proximity to Spires on Turbulent Characteristics and Structures
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SYSNO ASEP 0480521 Document Type C - Proceedings Paper (int. conf.) R&D Document Type The record was not marked in the RIV Title Impact of Proximity to Spires on Turbulent Characteristics and Structures Author(s) Kellnerová, Radka (UT-L) RID, ORCID
Jurčáková, Klára (UT-L) RID, ORCID
Procházka, Pavel P. (UT-L) RID, ORCID, SAI
Skála, Vladislav (UT-L) ORCID
Jaňour, Zbyněk (UT-L) RID, ORCIDSource Title PHYSMOD 2017. - Nantes : LHEEA-DAUC, Ecole Centrale de Nantes, 2017 Number of pages 6 s. Publication form Online - E Action PHYSMOD 2017 Event date 23.08.2017 - 25.08.2017 VEvent location Ecole Centrale de Nantes Country FR - France Event type WRD Language eng - English Country FR - France Keywords spires ; wind tunnel ; vorticity ; quadrant analysis ; wavelet analysis Subject RIV DG - Athmosphere Sciences, Meteorology R&D Projects GA15-18964S GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 Annotation Vertically truncated triangular spires (Irwin type) are applied to enhance turbulent diffusion from a surface upwards in order to increase an atmospheric boundary layer depth in wind tunnels. This paper studies the influence of variable upstream distances of spires on velocity statistics and formation of both vortical and non-vortical organized structures inside a test section. The 2C 2D time-resolved particle image velocimetry measured 2D streamwise-wall normal plane in the wind tunnel with a rough surface. Intermittent flow dynamics was evaluated by means
of skewness, cross-moments, vorticity, quadrant and wavelet analysis. The downstream evolution of the flow suggests that equilibrium between roughness- and spires-produced turbulence was reached in terms of statistics at the distance of seven spires height.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 2018
Number of the records: 1