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Material surfaces in stochastic flows: Integrals of motion and intermittency

A. S. Il'yn1,2,*, A. V. Kopyev1,†, V. A. Sirota1,‡, and K. P. Zybin1,2,§

  • 1P. N. Lebedev Physical Institute of RAS, 119991, Leninskij pr. 53, Moscow, Russia
  • 2National Research University Higher School of Economics, 101000, Myasnitskaya 20, Moscow, Russia

  • *asil72@mail.ru
  • †kopyev@lpi.ru
  • ‡sirota@lpi.ru
  • §zybin@lpi.ru

Phys. Rev. E 107, L023101 – Published 23 February, 2023

DOI: https://doi.org/10.1103/PhysRevE.107.L023101

Abstract

We consider the line, surface, and volume elements of fluid in stationary isotropic incompressible stochastic flow in d-dimensional space and investigate the long-time evolution of their statistic properties. We report the discovery of a family of d!−1 stochastical integrals of motion that are universal in the sense that their explicit form does not depend on the statistics of velocity. Only one of them has been discussed previously.

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