Production, transport and dissipation of turbulent helicity in rotating channel flow

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Other Title
  • 回転チャネル流における乱流ヘリシティの生成輸送と粘性散逸
  • カイテン チャネルリュウ ニ オケル ランリュウ ヘリシティ ノ セイセイ ユソウ ト ネンセイ サンイツ

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<p>To investigate the production and transport mechanism of helicity, we used LES of wall-normal rotating turbulent channel flow to examine the contribution of each term in the budgets of the turbulent helicity and its three parts hxx, hyy, and hzz. hxx and hzz were bigger than hyy and their signs were opposite to each other. We found that the pressure term contributes to hyy and is redistributed to hzz to decrease the absolute value of hzz. Therefore, hxx becomes the biggest term of three and forms positive helicity near the wall and negative helicity away from the wall. In the region away from the wall, the viscous dissipation term reduced the negative helicity of hxx.</p>

Journal

  • SEISAN KENKYU

    SEISAN KENKYU 74 (1), 5-10, 2022-02-01

    Institute of Industrial Science The University of Tokyo

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