### Abstract

There has been overwhelming evidence that coherent structures play a critical role in determining the overall transport in a variety of systems. We compute the probability distribution function (PDF) tails of momentum flux and heat flux in ion-temperature-gradient turbulence, by taking into account the interaction among modons, which are assumed to be coherent structures responsible for bursty and intermittent events, contributing to the PDF tails. The tail of PDF of momentum flux R= 〈 vx vy 〉 is shown to be exponential with the form exp {- R32 }, which is broader than a Gaussian, similar to what was found in the previous local studies. An analogous expression with the same functional dependence is found for the PDF tails of heat flux. Furthermore, we present a detailed numerical study of the dependence of the PDF tail on the temperature and density scale lengths and other physical parameters through the coefficient .

Original language | English |
---|---|

Article number | 052306 |

Journal | Physics of Plasmas |

Volume | 15 |

Issue number | 5 |

DOIs | |

Publication status | Published - 28 May 2008 |

Externally published | Yes |

### Fingerprint

### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Condensed Matter Physics

### Cite this

*Physics of Plasmas*,

*15*(5), [052306]. https://doi.org/10.1063/1.2918338

**The momentum flux probability distribution function for ion-temperature-gradient turbulence.** / Anderson, Johan; Kim, Eun Jin.

Research output: Contribution to journal › Article

*Physics of Plasmas*, vol. 15, no. 5, 052306. https://doi.org/10.1063/1.2918338

}

TY - JOUR

T1 - The momentum flux probability distribution function for ion-temperature-gradient turbulence

AU - Anderson, Johan

AU - Kim, Eun Jin

PY - 2008/5/28

Y1 - 2008/5/28

N2 - There has been overwhelming evidence that coherent structures play a critical role in determining the overall transport in a variety of systems. We compute the probability distribution function (PDF) tails of momentum flux and heat flux in ion-temperature-gradient turbulence, by taking into account the interaction among modons, which are assumed to be coherent structures responsible for bursty and intermittent events, contributing to the PDF tails. The tail of PDF of momentum flux R= 〈 vx vy 〉 is shown to be exponential with the form exp {- R32 }, which is broader than a Gaussian, similar to what was found in the previous local studies. An analogous expression with the same functional dependence is found for the PDF tails of heat flux. Furthermore, we present a detailed numerical study of the dependence of the PDF tail on the temperature and density scale lengths and other physical parameters through the coefficient .

AB - There has been overwhelming evidence that coherent structures play a critical role in determining the overall transport in a variety of systems. We compute the probability distribution function (PDF) tails of momentum flux and heat flux in ion-temperature-gradient turbulence, by taking into account the interaction among modons, which are assumed to be coherent structures responsible for bursty and intermittent events, contributing to the PDF tails. The tail of PDF of momentum flux R= 〈 vx vy 〉 is shown to be exponential with the form exp {- R32 }, which is broader than a Gaussian, similar to what was found in the previous local studies. An analogous expression with the same functional dependence is found for the PDF tails of heat flux. Furthermore, we present a detailed numerical study of the dependence of the PDF tail on the temperature and density scale lengths and other physical parameters through the coefficient .

UR - http://www.scopus.com/inward/record.url?scp=44649151045&partnerID=8YFLogxK

U2 - 10.1063/1.2918338

DO - 10.1063/1.2918338

M3 - Article

VL - 15

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 5

M1 - 052306

ER -