Experimental test of the crossover between the inertial and the dissipative range in a turbulent swirling flow

The kinetic energy spectrum of high-Reynolds turbulent swirling flows is experimentally studied. This spectrum, obtained from direct measurements in space, exhibits nearly two decades of Kol-mogorov k −5/3 decay in the inertial range of scales. Beyond this regime, in the dissipative range of scales,...

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Veröffentlicht in:Physical review fluids 2018-02, Vol.3 (2), Article 024602
Hauptverfasser: Debue, Paul, Kuzzay, Denis, Saw, Ewe-Wei, Daviaud, François, Dubrulle, Bérengère, Canet, Léonie, Rossetto, Vincent, Wschebor, Nicolás
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Sprache:eng
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Zusammenfassung:The kinetic energy spectrum of high-Reynolds turbulent swirling flows is experimentally studied. This spectrum, obtained from direct measurements in space, exhibits nearly two decades of Kol-mogorov k −5/3 decay in the inertial range of scales. Beyond this regime, in the dissipative range of scales, a crossover to a stretched exponential decay on scale k 2/3 is observed, in full agreement with a recent theoretical prediction based on Non-Perturbative Renormalization Group theory.
ISSN:2469-990X
2469-990X
DOI:10.1103/PhysRevFluids.3.024602