Nonperturbative models of intermittency in edge turbulence

被引：7
作者：
Anderson, Johan [1 ]
Kim, Eun-jin [1 ]
机构：
[1] Univ Sheffield, Dept Appl Math, Sheffield S3 7RH, S Yorkshire, England
来源：
PHYSICS OF PLASMAS | 2008年 / 15卷 / 12期
基金：
英国工程与自然科学研究理事会;
关键词：
convection; plasma boundary layers; plasma turbulence;
D O I：
10.1063/1.3036932
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
A theory of the probability distribution function (PDF) tails of the blob density in plasma edge turbulence is provided. A simplified model of the fast convective radial transport is used. The theoretically predicted PDF tails corroborate earlier measurements of edge transport, further confirming the strongly non-Gaussian feature of edge transport. It is found that increasing the cross-sectional spatial scale length (L-x and L-y) of the blob results in larger transport, whereas increasing the toroidal scale length (L-z) decreases the PDF. The results imply that the PDF decreases for larger blob speed v(b).
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页数：6
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