### Abstract

Quasi-two-dimensional decaying turbulence is studied in a flowing soap film by measuring the moments of the probability density function P(δv(r)) for the longitudinal velocity differences δv(r) on a scale r. As in three-dimensional (3-D) turbulence, P becomes non-Gaussian with decreasing r. The third moment S
_{3}
(r) ≡ 〈(δv(r))
^{3}
〉 is small and negative at small scales, but becomes positive at larger scales. The exact calculation of S
_{3}
(r) for 2-D homogeneous isotropic turbulence relates this change in sign to the development of the velocity correlation function as the turbulence decays.

Original language | English (US) |
---|---|

Pages (from-to) | 1196-1200 |

Number of pages | 5 |

Journal | Physics of Fluids |

Volume | 11 |

Issue number | 5 |

DOIs | |

State | Published - May 1999 |

### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics

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## Cite this

*Physics of Fluids*,

*11*(5), 1196-1200. https://doi.org/10.1063/1.869891