Number of the records: 1

Impact of Proximity to Spires on Turbulent Characteristics and Structures

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, ORCID}
Source 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