Abstract
Laboratory measurements of decaying quasi-two-dimensional turbulence in thin fluid layers with various depths have been performed. It has been shown that decay at large Reynolds numbers corresponds to a non-linear bottom friction with the coefficient satisfying the law λ ∼ (ν/h 2)1/2|K|1/4 following from theoretical estimates, where K is the Okubo-Weiss function depending on the enstrophy and degree of ellipticity of vortices. It has been shown that the structure of the flow changes in the decay process.
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Original Russian Text © S.V. Kostrykin, A.A. Khapaev, I.G. Yakushkin, 2012, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2012, Vol. 95, No. 10, pp. 583–588.
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Kostrykin, S.V., Khapaev, A.A. & Yakushkin, I.G. On the decay law of quasi-two-dimensional turbulence. Jetp Lett. 95, 515–520 (2012). https://doi.org/10.1134/S0021364012100074
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DOI: https://doi.org/10.1134/S0021364012100074