Development of an Efficient Time-Spectral Method for Periodically Unsteady Flow Solutions

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  • TANIICHI Keisuke
    連絡先著者（Corresponding author）：taniichi-keisuke-pv@ynu. jp 横浜国立大学大学院工学府
  • MIYAJI Koji
    横浜国立大学大学院工学研究院

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  • 時間スペクトル法による周期的非定常流れの効率的数値解法の研究
  • ジカン スペクトルホウ ニ ヨル シュウキテキ ヒテイジョウ ナガレ ノ コウリツテキ スウチ カイホウ ノ ケンキュウ

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A time-spectral, or reduced-frequency method for the CFD is developed in place of a time-marching method for simulations of periodically unsteady flows around oscillating bodies. The efficiencies and accuracies of the method are validated through comparisons with transonic-flow experiments for two- and three-dimensional wings. For the case of a three-dimensional viscous flow, the computation time to obtain the same periodic flow with a time-marching solution of a sufficiently fine time step was about 1/18 in the time-spectral method. The method is expected for applications to calculating dynamic derivatives of aircrafts or wing-flutter problem where the flow responses to small-amplitude oscillations are used to judge the stability.

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