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Comparison between Kinetic and Fluid Simulations of Slab Ion Temperature Gradient Driven Turbulence
http://hdl.handle.net/10655/2408
http://hdl.handle.net/10655/2408386892d2-6cdc-42f8-8476-98daa507ef8d
Item type | 研究報告書 / Research Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Comparison between Kinetic and Fluid Simulations of Slab Ion Temperature Gradient Driven Turbulence | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | kinetic and fluid simulations | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | ITG turbulence | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | closure model | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
"Sugama, H.
× "Sugama, H.× Watanabe, T. -H× Horton, W." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "A detailed comparison between kinetic and fluid simulations of collisionless slab ion temperature gradient (ITG) driven turbulence is made. The nondissipative closure model (NCM) for linearly unstable modes, which is presented by Sugama, Watanabe, and Horton [Phys.Plasmas 8 2617 (2001)], and the dissipative closure model by Hammett and Perkins (HP)[Phys.Rev.Lett.64, 3019 (1990)] are used in separate fluid simulations. The validity of these closure models for quantitative prediction of the turbulent thermal transport is examined by comparing nonlinear results of the fluid simulations with those of the collisionless kinetic simulation of high accuracy. Simulation results show that, in the saturated turbulent state, the turbulent thermal diffusivity chi obtained from the HP model is significantly larger than the chi given by the NCM which is closer to chi measured in the kinetic simulation. Contrary to the dissipative form of the parallel heat flux closure relation assumed in the HP model,the NCM describes well the exact kinetic simulation, in which for some unstable wave numbers k, the imaginary part of the ratio of the parallel heat flux q_k to the temperature fluctuation T_k is a oscillatory function of time and sometimes takes positive values. The positive values of Im(q_k/T_k),imply the negative parallel heat diffusivity, correlate with the occasional inward heat flux occurring for the wave numbers k,and reduce the total chi." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 2002-10-01 |
|||||
報告書番号 | ||||||
NIFS-748 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |