非定常境界層の非線形効果による摩擦抵抗の低減

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  • Frictional Drag Reduction by the Nonlinear Effect of an Unsteady Boundary Layer
  • 非定常境界層の非線形効果による摩擦抵抗の低減〔含 討論〕
  • ヒテイジョウ キョウカイソウ ノ ヒセンケイ コウカ ニ ヨル マサツ テイコウ ノ テイゲン ガン トウロン

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An unsteady boundary layer past an elastic flat plate with a leading fixed edge and a surging trailing edge was investigated utilizing both numerical and analytical methods. Analytical solutions for low and high frequencies were easily obtained along with conditions for the reduction of the skin friction drag. However, the analytical solution for intermediate frequencies were significantly more difficult. Since intermediate frequencies have some potential for application to engineering problems, a numerical method was chosen to analyze intermediate frequencies. The numerical results revealed a reduction of the skin friction drag from its steady state at intermediate frequencies.

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