Expanding the PIV Spectral Range and the Turbulence Generated by Grid of Prismatic Circular Cylinders

0575056 - ÚT 2024 FR eng C - Conference Paper (international conference)
Duda, D. - Yanovych, Vitalii - Uruba, Václav
Expanding the PIV Spectral Range and the Turbulence Generated by Grid of Prismatic Circular Cylinders.
MATEC Web of Conferences. Vol. 369. Grenoble: EDP Sciences, 2022, č. článku 05004. E-ISSN 2261-236X.
[MATEC Web of Conferences : MDFMT & XXIII. AEaNMiFMaE-2022 /40./. Piešťany (SK), 12.09.2022-14.09.2022]
Institutional support: RVO:61388998
Keywords : particle image velocimetry * grid turbulence * spectrum * anisotropy * flatness
OECD category: Applied mechanics
https://www.matec-conferences.org/articles/matecconf/pdf/2022/16/matecconf_aenmmte2022_05004.pdf

The grid turbulence past a grid made of row of prismatic circular rods (rod diameter = 10 mm, rod spacing = 20 mm) perpendicular to the flow is observed by using a pair of PIV cameras. The first one has field of view larger (81 mm), the second one smaller (31 mm), which increases the dynamical range, where the spectral turbulence properties can be explored. Energy spectra displays usual behavior approximately following k −5/3 law, the anisotropy originates at larger scales and the flatness describing strong rare events is connected with smaller scales. The spectral properties of vorticity do not collapse due to the different lengthscale of differentiation, which make questionable the previous research based on the vorticity statistics.


Permanent Link: https://hdl.handle.net/11104/0351479