| Issue |
EPL
Volume 87, Number 4, August 2009
|
|
|---|---|---|
| Article Number | 44007 | |
| Number of page(s) | 6 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/87/44007 | |
| Published online | 15 September 2009 | |
Drag fluctuations of a disk in a turbulent jet: Effect of turbulent scales averaging
1
Unité de Mécanique, École supérieure de Techniques avancées - Chemin de la Hunière, 91761 Palaiseau Cedex, France, EU
2
Department of Research and Innovation, PSA Peugeot-Citroen - 2 route de Gisy, 78943 Vélizy-Villacoublay, France, EU
Corresponding author: bthiria@pmmh.espci.fr
Received:
13
March
2009
Accepted:
13
August
2009
The drag fluctuations of a disk placed on the axis of a turbulent incompressible jet are studied at 
. Statistics and spectra have been obtained for different disk sizes. A significant spatial averaging effect is observed in the symmetrization of probability distribution function and in the low-pass filtering of spectra. These effects are associated with a redistribution of the high-frequencies energy to the low frequencies. It is shown that this redistribution is done in such a way that the rms value of the drag fluctuations increases linearly with the disk surface. These results concerning the drag fluctuations are compared and found to be consistent with fluctuations of a global kinetic energy extracted from the turbulent field in front of the disk.
PACS: 47.27.wg – Turbulent jets / 47.27.Gs – Isotropic turbulence; homogeneous turbulence
© EPLA, 2009
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