日本語フィールド
著者：押川 英夫，小松 利光，柴多 哲郎，深田 剛教題名：振動流場における非対称没水構造物の方向抵抗特性に関する実験的研究発表情報：水工学論文集 巻: 47 ページ: 805-810キーワード：概要：Directional characteristics of hydrodynamic force on a submerged asymmetrical roughness (we call this roughness BaNK block) in oscillatory flows were experimentally investigated. In this study, a quarter sphere or a half cylinder is used as a BaNK block which is set on the bottom of channel with an angle of attack θ to an oscillating flow direction. It is found that residual hydrodynamic force on half cylinder is much larger than that on quarter sphere because the substantial length of quarter sphere is smaller than that of half cylinder. Furthermore, residual hydrodynamic force on BaNK blocks is almost constant with the change of θ when Keulegan-Carpenter number KC is small. However, in large KC number, the force on quarter sphere decreases with the increase of θ because residual lift force decreases in θ=50°-90°.抄録：英語フィールド
Author：OSHIKAWA Hideo, KOMATSU Toshimitsu, SHIBATA Tetsuro, FUKATA TakenoriTitle：AN EXPERIMENTAL STUDY ON DIRECTIONAL RESISTANCE PROPERTIES OF A SUBMERGED ASYMMETRICAL ROUGHNESSAnnouncement information:Annual Journal of Hydraulic Engineering, JSCE Vol: 47 Page: 805-810An abstract：Directional characteristics of hydrodynamic force on a submerged asymmetrical roughness (we call this roughness BaNK block) in oscillatory flows were experimentally investigated. In this study, a quarter sphere or a half cylinder is used as a BaNK block which is set on the bottom of channel with an angle of attack θ to an oscillating flow direction. It is found that residual hydrodynamic force on half cylinder is much larger than that on quarter sphere because the substantial length of quarter sphere is smaller than that of half cylinder. Furthermore, residual hydrodynamic force on BaNK blocks is almost constant with the change of θ when Keulegan-Carpenter number KC is small. However, in large KC number, the force on quarter sphere decreases with the increase of θ because residual lift force decreases in θ=50°-90°.