OVERSHOOT OF WIND FORCES ON A BODY UNDER STEP-FUNCTION-LIKE GUSTY WINDS

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  • TAKEUCHI Takashi
    Assistant Prof., Graduate School of Engineering, Kobe University, Ph. D.
  • MAEDA Junji
    Prof., Faculty of Human Environment Studies, Kyushu University, Dr. Eng.

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Other Title
  • ステップ関数的突風を受ける物体のオーバーシュート風力
  • ステップ関数的突風を受ける物体のオーバーシュート風力 : 基本形状物体に作用する非定常抗力の実験的検討
  • ステップ カンスウテキ トップウ オ ウケル ブッタイ ノ オーバーシュート フウリョク : キホン ケイジョウ ブッタイ ニ サヨウ スル ヒテイジョウ コウリョク ノ ジッケンテキ ケントウ
  • —Experimental study on unsteady drag force on a basic shaped body—
  • －基本形状物体に作用する非定常抗力の実験的検討－

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Description

The characteristics of unsteady wind forces on a basic shaped body under step-function-like gusty wind were investigated using a specially-equipped wind tunnel. We found that a more remarkable overshoot phenomenon of wind force appeared in case of a gust with a shorter rise time, a lower wind speed and a larger section-size of body. Moreover, it turned out that the overshoot coefficient which was defined by a ratio of its maximum to a steady-state value of wind force was determined by the non-dimensional rise time which was composed by its rise time, gust speed and section-size of a body.

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