Title:	Effect of Cylinder Roughness on Strouhal Number
Authors:	Yanovych, Vitalii Duda, Daniel Uruba, Václav Procházka, Pavel Antoš, Pavel
Citation:	YANOVYCH, V. DUDA, D. URUBA, V. PROCHÁZKA, P. ANTOŠ, P. Effect of Cylinder Roughness on Strouhal Number. In Topical Problems of Fluid Mechanics 2022. Praha: Institute of Thermomechanics AS CR, 2022. s. 201-207. ISBN: 978-80-87012-77-2 , ISSN: 2336-5781
Issue Date:	2022
Publisher:	Institute of Thermomechanics AS CR
Document type:	konferenční příspěvek ConferenceObject
URI:	http://hdl.handle.net/11025/49263
ISBN:	978-80-87012-77-2
ISSN:	2336-5781
Keywords in different language:	roughened cylinder;Strouhal number;spectral distribution;turbulence structure;hot-wire anemometry
Abstract in different language:	The main goal of this paper is to establish a better understanding of the relationship between a Strouhal number and surface roughness. Hot-wire anemometry was used to evaluations the characteristics of turbulent flow behind circular cylinders with different relative roughness 0% (smooth surface) 0.83%, 1.67%, 3.33%, and 6.67%. At the experimental investigation, the Reynolds number based on the cylinder diameter was 5 × 103 < Red < 2 × 104. The obtained data showed that the Strouhal number decreased with increasing roughness. While, the dissipation rate decreases, and the value of the Kolmogorov and Taylor microscales increases. Also, spectral analysis of streamwise velocity fluctuations allowed us to estimate the location of the vortex-shedding frequency which at growing roughness tends to reduce.
Rights:	© Institute of Thermomechanics AS CR
Appears in Collections:	Konferenční příspěvky / Conference papers (KKE) Konferenční příspěvky / Conference papers (CEV) OBD

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