How pattern is selected in drift wave turbulence: Role of parallel flow shear

研究成果: ジャーナルへの寄稿記事

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The role of parallel shear flow in the pattern selection problem in drift wave turbulence is discussed. Patterns of interest here are E × B convective cells, which include poloidally symmetric zonal flows and radially elongated streamers. The competition between zonal flow formation and streamer formation is analyzed in the context of modulational instability analysis, with the parallel flow shear as a parameter. For drift wave turbulence with k∥ρs ≲ O(1) and without parallel flow coupling, zonal flows are preferred structures. While increasing the magnitude of parallel flow shear, streamer growth overcomes zonal flow growth. This is because the self-focusing effect of the modulational instability becomes more effective for streamers through density and parallel velocity modulation. As a consequence, the bursty release of free energy may result as the parallel flow shear increases.

元の言語英語
記事番号122305
ジャーナルPhysics of Plasmas
24
発行部数12
DOI
出版物ステータス出版済み - 12 1 2017

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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