Spectrum of Passive Scalar at Very High Schmidt Number in Turbulence

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抄録

A hybrid code which uses the spectral method for an incompressible fluid and the combined compact finite difference method for passive scalar is developed and applied to compute the spectrum of the passive scalar variance in turbulence at very high Schmidt numbers up to 1000. The accuracy and efficiency of the hybrid code are found to be very satisfactory when compared to the full spectral computation. The scalar spectrum in the viscous-convective range by direct numerical simulation is found to obey <i>k</i><sup>−1 </sup>power law and to exponentially decay in the far diffusive range, and compared to Kraichnan's spectrum. It is argued that the exponential decay of the spectrum in the far diffusive range is due to the intermittency effect of the velocity field.

収録刊行物

  • Plasma and Fusion Research

    Plasma and Fusion Research 9(0), 3401019-3401019, 2015

    社団法人 プラズマ・核融合学会

各種コード

  • NII論文ID(NAID)
    130005098528
  • 本文言語コード
    ENG
  • データ提供元
    J-STAGE 
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