Coherent structures in turbulent atmosphere

V. V. Nosov; V. M. Grigoriev; P. G. Kovadlo; V. P. Lukin; E. V. Nosov; A. V. Torgaev

doi:10.1117/12.823804

11 February 2009 Coherent structures in turbulent atmosphere

V. V. Nosov, V. M. Grigoriev, P. G. Kovadlo, V. P. Lukin, E. V. Nosov, A. V. Torgaev

Proceedings Volume 7296, Fifteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics; 729609 (2009) https://doi.org/10.1117/12.823804
Event: Fifteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2008, Krasnoyarsk, Russian Federation

Abstract

Processes of Benard cell origination and disintegration in air are studied experimentally. It is shown that temperature gradients cause a Benard cell. Our data confirm the main scenarios of turbulence origination (Landau-Hopf, Ruelle-Takens, Feigenbaum, and Pomeau-Menneville stochastic scenarios). It is ascertained that a Benard cell disintegrates according to the Feigenbaum scenario. In this case, the main vortex in the Benard cell is decomposed into smaller ones as a result of ten period-doubling bifurcations. It is shown that the resulting turbulence is coherent and determinate; the fractal character (local self-similarity) of its spectrum is found. These results allow the definition of a coherent structure as a compact formation containing a long-lived threedimensional hydrodynamic cell (originating from long-term action of thermodynamic gradients) and products of its discrete coherent cascade disintegration. The coherent structure answers all the signs of chaos occurrence (turbulence) in typical thermodynamic structures. On the base of the results, presented in this work, a coherent structure can be considered as a key turbulence element. It is shown that the real atmospheric turbulence is the result of mixing of different coherent structures.

Citation Download Citation

V. V. Nosov, V. M. Grigoriev, P. G. Kovadlo, V. P. Lukin, E. V. Nosov, and A. V. Torgaev "Coherent structures in turbulent atmosphere", Proc. SPIE 7296, Fifteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 729609 (11 February 2009); https://doi.org/10.1117/12.823804

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