Nonlinear Simulation of Ion Temperature Gradient Driven Drift Wave Turbulence

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  • Ueda,Tetsuji
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Tokunaga Shinsuke
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Ito Sanae -I.
    Research Institute for Applied Mechanics, Kyushu University
  • Yagi Masatoshi
    Research Institute for Applied Mechanics, Kyushu University
  • Azumi Masafumi
    Naka Fusion Institute, Japan Atomic Energy Agency

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Abstract

The gyro-fluid model proposed by Ottaviani et. al is extended, in which the ion parallel flow and ion neoclassical viscosity are taken into account. Using this model, the ion temperature gradient driven drift wave turbulence is analyzed. The saturation level and ion heat flux are evaluated in case with profile relaxation. The multi-scale interaction between the micro-scale and meso-scale is observed in our simulations. The avalanche process and turbulence spreading occur in the nonlinear phase. In addition, the various kind of parallel scheme are tested to improve the performance of the code. We find a way which gives better parallel efficiency of the spectral code.

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