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Potential anisotropic finite-time singularity in the three-dimensional axisymmetric Euler equations

Sergio Rica

  • Instituto de Física, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile

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Phys. Rev. Fluids 7, 034401 – Published 31 March, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.034401

Abstract

The search of finite-time singularity solutions of Euler equations is considered for the case of an incompressible and inviscid fluid. Under the assumption that a finite-time blow-up solution may be spatially anisotropic as time goes by such that the flow contracts more rapidly into one direction than into the other, it can be shown that the dynamics of an axially symmetric flow with swirl may be approximated to a simpler hyperbolic system. By using the method of characteristics, it can be shown that generically the velocity flow exhibits multivalued solutions appearing on a rim at a finite distance from the axis of rotation, which displays a singular behavior in the radial derivatives of velocities. Moreover, the general solution shows a genuine blow-up, which is also discussed. This singularity is generic for a vast number of smooth finite-energy initial conditions and is characterized by a local singular behavior of velocity gradients and accelerations.

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Outline

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Phys. Rev. Fluids 7, 034401– Published 31 March, 2022
  • Received 31 January 2021
  • Accepted 7 March 2022
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