Article (Scientific journals)
Experimental characterization of the flow and turbulence generated by fractal oscillating grids
Musy, Valentin; Hantson, Anne-Lise; Thomas, Diane et al.
2024In Physics of Fluids, 36 (10)
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Keywords :
Experimental characterization; Fractal grids; Grid turbulence; Oscillating grids; Fluid Flow and Transfer Processes
Abstract :
[en] Inspired from the existing literature on fractal grids in channels and as an extension to classical oscillating grid experiments with simple Cartesian grids, an original investigation of fractal oscillating grid turbulence is here reported. The flows generated by a simple Cartesian grid, a fractal Cartesian grid, a fractal square grid, and a fractal I-shaped grid are studied using particle image velocimetry. Three oscillation frequencies (0.5, 1, and 1.5 Hz ) and three stroke amplitudes (0.02, 0.035, and 0.05 m ) are considered. The flows are broken down into mean (time averaged), oscillatory (phase dependent), and turbulent contributions using the triple Reynolds decomposition. The oscillation frequency is found to linearly impact the intensity of the mean and the oscillatory flows and the root mean square values of the turbulent fluctuations. In turn, an increase in the stroke amplitude tends to change the topology of the mean and the oscillatory flows. The turbulence intensity is increased by the fractal nature of the grids and is impacted by the mean flow topology, especially for the fractal I-shaped grid for which turbulence is transported away from the grid wake region. The study of the turbulence length scales and spectra reveals that the scales of turbulence mainly depend on the stroke amplitude and the grid geometry. We thus show how fractal oscillating grids can be used to generate turbulence with tailored properties for fundamental studies and practical applications.
Disciplines :
Physics
Author, co-author :
Musy, Valentin  ;  Université de Mons - UMONS > Faculté Polytechnique > Service de Génie des Procédés chimiques et biochimiques ; IMT Nord Europe, Institut Mines Télécom, Université de Lille, Center for Energy and Environment, Lille, France
Hantson, Anne-Lise  ;  Université de Mons - UMONS > Faculté Polytechnique > Service de Génie des Procédés chimiques et biochimiques
Thomas, Diane  ;  Université de Mons - UMONS > Faculté Polytechnique > Service de Génie des Procédés chimiques et biochimiques
Baudez, Jean-Christophe ;  IMT Nord Europe, Institut Mines Télécom, Université de Lille, Center for Energy and Environment, Lille, France
Lacassagne, Tom ;  IMT Nord Europe, Institut Mines Télécom, Université de Lille, Center for Energy and Environment, Lille, France
Language :
English
Title :
Experimental characterization of the flow and turbulence generated by fractal oscillating grids
Alternative titles :
[fr] Caractérisation expérimentale des écoulements et de la turbulence générés par des grilles oscillantes fractales
Original title :
[en] Experimental characterization of the flow and turbulence generated by fractal oscillating grids
Publication date :
14 October 2024
Journal title :
Physics of Fluids
ISSN :
1070-6631
eISSN :
1089-7666
Publisher :
American Institute of Physics
Volume :
36
Issue :
10
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
F505 - Génie des Procédés chimiques et biochimiques
F505 - Génie des Procédés chimiques et biochimiques
Research institute :
Biosciences
Funders :
Agence Nationale de la Recherche
UMONS - Université de Mons
Funding number :
ANR-22-CE51-0015-01
Funding text :
This work was partially funded by the French National Research Agency (IFrOG Project No. ANR-22-CE51-0015-01) and by a doctoral scholarship granted by the University of Mons and Institut Mines T\u00E9l\u00E9com Nord Europe.
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