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Transport reduction via shear flow modification of the cross phase

A S Ware, P W Terry, P H Diamond, B A Carreras1996年Plasma Physics and Controlled FusionIF 2.2出版社

As a model example of the effect of shear flow on the cross phase between electrostatic potential and pressure fluctuations, a nonlinear theory of resistive pressure gradient driven turbulence (RPGDT) in a shear flow is presented. This work builds on numerical studies of RPGDT, which have shown that both flow shear and curvature can affect the cross phase as well as the fluctuation levels. In this work, we show that the effect of shear flow on transport can be expressed through the temporal response of pressure to potential. It is shown heuristically that even in the case where the fluctuation levels are not modified, the flow shear still acts to reduce the phase angle between potential and pressure fluctuations, thereby suppressing transport. The scaling of the cross phase with flow shear and flow curvature is presented.

日本語訳

抵抗性圧力勾配駆動乱流(RPGDT)におけるせん断流の効果を、静電ポテンシャルと圧力変動間のクロス位相に対するモデル例として、せん断流中の抵抗性圧力勾配駆動乱流の非線形理論を提示する。本研究は、流れのせん断と曲率の両方がクロス位相および変動レベルに影響を与え得ることを示した数値研究に基づいている。本論文では、せん断流の輸送への影響が、圧力のポテンシャルに対する時間応答を通じて表現できることを示す。変動レベルが変化しない場合でも、流れのせん断がポテンシャルと圧力変動間の位相角を減少させ、それにより輸送を抑制することを発見的に示す。クロス位相のせん断流および流れの曲率に対するスケーリング則を提示する。

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