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Far field geometric structures of 2D flows with localised vorticity

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Abstract

We show that 2D Navier–Stokes and Euler flows with localised vorticity always feature regular structures in the far field. The level lines of each component of the velocity, at large distances, tend to have the symmetries of a regular polygon: a digon if the total circulation is non-zero; a square for flows with zero total circulation and non-integrable velocity; an hexagon for flows with integrable velocity and, exceptionally, a polygon with more than six sides.

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Acknowledgements

The author would like to thank the referees for their careful reading and useful remarks. Their suggestions are incorporated in the present version.

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Correspondence to Lorenzo Brandolese.

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Communicated by Y. Giga.

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Brandolese, L. Far field geometric structures of 2D flows with localised vorticity. Math. Ann. 383, 699–714 (2022). https://doi.org/10.1007/s00208-021-02177-8

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  • DOI: https://doi.org/10.1007/s00208-021-02177-8

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