Abstract
The probability distribution function (PDF) tails of the zonal flow structure formation and the PDF tails of momentum flux are computed by incorporating the effect of a shear flow in ion-temperature-gradient (ITG) turbulence. The bipolar vortex soliton (modon) is assumed to be the coherent structure responsible for bursty and intermittent events driving the PDF tails. It is found that stronger zonal flows are generated in ITG turbulence than Hasegawa-Mima turbulence, as well as further from marginal stability. This suggests that although ITG turbulence has a higher level of heat flux, it also more likely generates stronger zonal flows, leading to a self-regulating system. It is also shown that shear flows can significantly reduce the PDF tails of Reynolds stress and structure formation.
| Original language | English |
|---|---|
| Article number | 082312 |
| Journal | Physics of Plasmas |
| Volume | 15 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 8 Sep 2008 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
Analytical theory of the probability distribution function of structure formation. / Anderson, Johan; Kim, Eun Jin.
In: Physics of Plasmas, Vol. 15, No. 8, 082312, 08.09.2008.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Analytical theory of the probability distribution function of structure formation
AU - Anderson, Johan
AU - Kim, Eun Jin
PY - 2008/9/8
Y1 - 2008/9/8
N2 - The probability distribution function (PDF) tails of the zonal flow structure formation and the PDF tails of momentum flux are computed by incorporating the effect of a shear flow in ion-temperature-gradient (ITG) turbulence. The bipolar vortex soliton (modon) is assumed to be the coherent structure responsible for bursty and intermittent events driving the PDF tails. It is found that stronger zonal flows are generated in ITG turbulence than Hasegawa-Mima turbulence, as well as further from marginal stability. This suggests that although ITG turbulence has a higher level of heat flux, it also more likely generates stronger zonal flows, leading to a self-regulating system. It is also shown that shear flows can significantly reduce the PDF tails of Reynolds stress and structure formation.
AB - The probability distribution function (PDF) tails of the zonal flow structure formation and the PDF tails of momentum flux are computed by incorporating the effect of a shear flow in ion-temperature-gradient (ITG) turbulence. The bipolar vortex soliton (modon) is assumed to be the coherent structure responsible for bursty and intermittent events driving the PDF tails. It is found that stronger zonal flows are generated in ITG turbulence than Hasegawa-Mima turbulence, as well as further from marginal stability. This suggests that although ITG turbulence has a higher level of heat flux, it also more likely generates stronger zonal flows, leading to a self-regulating system. It is also shown that shear flows can significantly reduce the PDF tails of Reynolds stress and structure formation.
UR - http://www.scopus.com/inward/record.url?scp=50849124434&partnerID=8YFLogxK
U2 - 10.1063/1.2973177
DO - 10.1063/1.2973177
M3 - Article
VL - 15
JO - Physics of Plasmas
JF - Physics of Plasmas
SN - 1070-664X
IS - 8
M1 - 082312
ER -