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- W3207899350 abstract "Abstract We formalise the concept of near resonance for the rotating Navier–Stokes equations, based on which we propose a novel way to approximate the original partial differential equation (PDE). The spatial domain is a three-dimensional flat torus of arbitrary aspect ratios. We prove that the family of proposed PDEs are globally well-posed for any rotation rate and initial datum of any size in any H s space with <?CDATA $sgeqslant0$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>s</mml:mi> <mml:mo>⩾</mml:mo> <mml:mn>0</mml:mn> </mml:math> . Such approximations retain many more 3-mode interactions, and are thus more accurate, than the conventional exact-resonance approach. Our approach is free from any limiting argument that requires physical parameters to tend to zero or infinity, and is free from any use of small divisors (so that all estimates depend smoothly on the torus’s aspect ratios). The key estimate hinges on the counting of integer solutions of Diophantine inequalities rather than Diophantine equations. Using a range of novel ideas, we handle rigorously and optimally challenges arising from the non-trivial irrational functions in these inequalities. The main results and ingredients of the proofs can form part of the mathematical foundation of a non-asymptotic approach to nonlinear, oscillatory dynamics in real-world applications." @default.
- W3207899350 created "2021-10-25" @default.
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- W3207899350 date "2023-02-28" @default.
- W3207899350 modified "2023-10-14" @default.
- W3207899350 title "Near-resonance approximation of rotating Navier–Stokes equations" @default.
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- W3207899350 doi "https://doi.org/10.1088/1361-6544/acb7c5" @default.
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