| Issue |
MATEC Web Conf.
Volume 369, 2022
40th Annual Conference - Meeting of the Departments of Fluid Mechanics and Thermomechanics in the connection with XXIII. International Scientific Conference - The Application of Experimental and Numerical Methods in Fluid Mechanics and Energy (40th. MDFMT & XXIII. AEaNMiFMaE-2022)
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| Article Number | 05004 | |
| Number of page(s) | 7 | |
| Section | Visualization of Flow | |
| DOI | https://doi.org/10.1051/matecconf/202236905004 | |
| Published online | 04 November 2022 | |
Expanding the PIV Spectral Range and the Turbulence Generated by Grid of Prismatic Circular Cylinders
1 Faculty of Mechanical Engineering, University of West Bohemia, 306 14 Pilsen, Czech Republic
2 Instituta of Thermomechanics, Czech Academy of Sciences, 180 00 Prague, Czech Republic
* Corresponding author: dudad@kke.zcu.cz
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.
Research background: Grid turbulence is the best experimentally accessible prototype of ideal homogenous and isotropic turbulence, although it is known, it is not exactly the ideal one.
Purpose of the article: This contribution explores the possibility of expanding the limited dynamical range of PIV method.
Methods: Particle Image Velocimetry is based on observing the motion of small particles carried by the flow.
Findings & Value added: Anisotropy connected with large scales, flatness with small scales; it does not work for vorticity.
Key words: Particle Image Velocimetry / Grid turbulence / Spectrum / Anisotropy / Flatness
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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