スガ　カズヒコ   Kazuhiko Suga   須賀　一彦    所属   追手門学院大学  理工学部 機械工学科    職種   教授
言語種別	英語
発行・発表の年月	2019
形態種別	外国学会誌（First author）
査読	査読あり
標題	Measurement of turbulent square duct flows over anisotropic porous media
執筆形態	共著・編著（代表編著を除く）
掲載誌名	11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
掲載区分	国外
出版社・発行元	Begell House
著者・共著者	K. Suga,Y. Okazaki,T. Matsuo,A. Taneo,Y. Kuwata
概要	© 2019 International Symposium on Turbulence and Shear Flow Phenomena, TSFP. All rights reserved. To understand the effect of anisotropic permeability on surface turbulence, PIV measurements are performed for square duct flows over two transparent anisotropic porous structures whose ratios of the wall-normal to streamwise permeabilities are 0.8 and 7.8. The obtained results at Re=3500 and 8000 confirm that although turbulence is enhanced by the permeability, turbulence over and under the porous surfaces is insensitive to the wall-normal permeability compared with the other components when the wall-normal permeability is sufficiently large. Near the symmetry planes, Kelvin-Helmholtz type waves are detected at the porous surfaces. While the effects of the wall-normal permeability on the wavelengths are not observed, it is found that their characteristics are similar to those reported in the literature for boundary layer flows over porous media.