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- W3158423325 abstract "This paper presents a geometric microcanonical ensemble perspective on two-dimensional truncated Euler flows, which contain a finite number of (Fourier) modes and conserve energy and enstrophy. We explicitly perform phase space volume integrals over shells of constant energy and enstrophy. Two applications are considered. In the first part, we determine the average energy spectrum for highly condensed flow configurations and show that the result is consistent with Kraichnan’s canonical ensemble description, despite the fact that no thermodynamic limit is invoked. In the second part, we compute the probability density for the largest-scale mode of a free-slip flow in a square, which displays reversals. We test the results against numerical simulations of a minimal model and find excellent agreement with the microcanonical theory, unlike the canonical theory, which fails to describe the bimodal statistics. This article is part of the theme issue ‘Mathematical problems in physical fluid dynamics (part 2)’." @default.
- W3158423325 created "2021-05-10" @default.
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- W3158423325 date "2022-05-09" @default.
- W3158423325 modified "2023-10-18" @default.
- W3158423325 title "Geometric microcanonical theory of two-dimensional truncated Euler flows" @default.
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- W3158423325 doi "https://doi.org/10.1098/rsta.2021.0049" @default.
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