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Vortex burst as a source of turbulence
Yannis Cuypers1, Agnès Maurel, Philippe Petitjeans
1Laboratoire de Physique et de Mécanique des Milieux Hétérogènes, UMR 7636, Ecole Supérieure de Physique et de Chimie Industrielles, 10 rue Vauquelin, 75005 Paris, France.
Physical Review Letters
|November 13, 2003
Summary
Researchers experimentally identified spiral vortex structures as key to the k(-5/3) energy spectrum in turbulence. This finding provides the first experimental evidence linking these specific structures to the turbulent energy cascade.
Area of Science:
- Fluid Dynamics
- Turbulence Theory
Background:
- Understanding elementary flow structures is crucial for explaining Kolmogorov's k(-5/3) energy spectrum law in turbulence.
- Lundgren proposed a model of a spiral vortex under axial strain as a potential elementary structure.
Purpose of the Study:
- To experimentally investigate if Lundgren's spiral vortex model is responsible for the k(-5/3) energy spectrum.
- To provide the first experimental evidence linking a specific elementary structure to the turbulent energy cascade.
Main Methods:
- Experimental observation of a vortex burst in a laminar flow environment.
- Analysis of the energy spectrum of the observed flow structures.
Main Results:
- The experimental results demonstrate that the observed spiral vortex structure generates a k(-5/3) component in the energy spectrum.
- This specific structure was experimentally confirmed to be responsible for a portion of the turbulent energy cascade.
Conclusions:
- The study provides the first experimental validation of spiral vortex structures as the elementary components driving the k(-5/3) energy spectrum.
- This research advances the understanding of turbulence theory by experimentally linking specific flow structures to energy cascade mechanisms.