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Non-local approach to kinetic effects on parallel transport in fluid models of the scrape-off layer

J T Omotani, B D Dudson2013年Plasma Physics and Controlled FusionIF 2.2出版社

Using a non-local model, fluid simulations can capture kinetic effects in the parallel electron heat-flux better than is possible using flux limiters in the usual diffusive models. Non-local and diffusive models are compared using a test case representative of an edge-localized mode crash in the JET scrape-off layer (SOL), simulated in one dimension. The non-local model shows substantially enhanced electron temperature gradients, which cannot be achieved using a flux limiter. The performance of the implementation, in the BOUT++ framework, is also analysed to demonstrate its suitability for application in three-dimensional simulations of turbulent transport in the SOL.

日本語訳

非局所モデルを用いることで、通常の拡散モデルにおけるフラックスリミッターを用いるよりも、電子の平行方向熱流束における運動論的効果を流体シミュレーションでより良く捉えることができる。非局所モデルと拡散モデルを、JETスクレイプオフ層(SOL)におけるエッジ局在モードの崩壊を代表するテストケースを用いて、一次元シミュレーションで比較した。非局所モデルは、フラックスリミッターを用いた場合には達成できない、大幅に増強された電子温度勾配を示す。また、BOUT++フレームワークにおける実装の性能も解析し、SOLにおける乱流輸送の三次元シミュレーションへの適用可能性を示した。

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Scrape-off layer
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