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Confinement and bursty transport in a flux-driven convection model with sheared flows

O E Garcia, N H Bian, J-V Paulsen, S Benkadda, K Rypdal2003年Plasma Physics and Controlled FusionIF 2.2出版社

Transport and confinement within the resistive-g paradigm are investigated by means of two-dimensional numerical simulations. The system is driven by a constant incoming heat flux at the inner radial boundary. Different confinement and transport states are identified, involving self-sustained sheared poloidal flows. At the onset of turbulent convection the probability distribution functions of pressure and radial velocity fluctuations measured in the centre of the plasma layer have a nearly Gaussian form. Further increasing the heat flux drive these distributions become increasingly non-Gaussian, developing exponential tails. This large-scale intermittency is ascribed to the presence of bursting in the domain averaged convective transport and the fluctuation energy integrals. The quasi-periodic bursts are separated by shear-dominated quiescent periods in which the mean flow energy decreases and the confined heat increases on diffusive timescales. The time-averaged thermal energy confined within the plasma layer shows a power law dependence and significant increase with the injected power over the range of turbulent convection investigated.

日本語訳

抵抗性gパラダイムにおける輸送と閉じ込めは、二次元数値シミュレーションによって調べられる。この系は、内側の動径境界において一定の入射熱流束によって駆動される。異なる閉じ込め状態と輸送状態が特定され、それには自己維持型のシア流(ポロイダル流)が関与する。乱流対流の開始時には、プラズマ層の中心で測定された圧力と動径速度の変動の確率分布関数は、ほぼガウス形を示す。熱流束駆動をさらに増加させると、これらの分布はますます非ガウス形となり、指数関数的な裾野を発達させる。この大規模間欠性は、領域平均された対流輸送と変動エネルギーの積分におけるバースト現象の存在に帰属される。準周期的なバーストは、シア流が支配的な静穏期によって分離され、その期間中は平均流エネルギーが減少し、閉じ込められた熱が拡散的な時間スケールで増加する。プラズマ層内に閉じ込められた時間平均熱エネルギーは、調査された乱流対流の範囲において、入射パワーに対してべき乗則の依存性と有意な増加を示す。

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