Abstract
We investigate fluctuations of vorticity inside a coherent vortex generated by the inverse energy cascade in two-dimensional turbulence. Temporal and spatial correlations can be characterized by the pair correlation function. The interaction of fluctuations leads to a nonzero third moment of vorticity. We analyze the pair correlation function and the third moment using a model in which the pumping is short-correlated in time and derive explicit expressions for the Gaussian spatial correlation function for the pumping force.
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Funding
The work of I.V. Kolokolov was performed within the research program of the National Center of Physics and Mathematics (project “Physics of High Energy Densities”, stage 2023–2025). Authors V.V.L. and M.M.T. are grateful for the support to the Ministry of Higher Education and Science of the Russian Federation (project no. 075-15-2022-1099) and the “Basis” Foundation.
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Translated by N. Wadhwa
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Kolokolov, I.V., Lebedev, V.V. & Tumakova, M.M. Correlations of Vorticity Inside a Coherent Vortex. J. Exp. Theor. Phys. 136, 785–794 (2023). https://doi.org/10.1134/S1063776123060122
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DOI: https://doi.org/10.1134/S1063776123060122