Název:
Effect of Cylinder Roughness on Strouhal Number
Autoři:
Yanovych, Vitalii ; Duda, D. ; Uruba, Václav ; Procházka, Pavel P. ; Antoš, Pavel Typ dokumentu: Příspěvky z konference Konference/Akce: Topical Problems of Fluid Mechanics 2022, Prague (CZ), 20220216
Rok:
2022
Jazyk:
eng
Abstrakt: 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.
Klíčová slova:
Hot-wire anemometry; roughened cylinder; spectral distribution; Strouhal number; turbulence structure Číslo projektu: TH02020057 (CEP) Poskytovatel projektu: GA TA ČR Zdrojový dokument: Proceedings of Topical Problems of Fluid Mechanics 2022, ISBN 978-80-87012-77-2, ISSN 2336-5781