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	2016/10
形態種別	外国学術誌（その他）
査読	査読あり
標題	Lattice Boltzmann direct numerical simulation of interface turbulence over porous and rough walls
執筆形態	共著・編著（代表編著を除く）
掲載誌名	INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
掲載区分	国外
出版社・発行元	ELSEVIER SCIENCE INC
巻・号・頁	61,pp.145-157
著者・共著者	Y. Kuwata,K. Suga
概要	To discuss the turbulent flow physics over porous walls, direct numerical simulation (DNS) of a porous walled channel flow at the bulk Reynolds number of 3000 is performed by the D3Q27 multiple-relaxation time lattice Boltzmann method. The presently considered porous layer, whose porosity is 0.71, consists of interconnected staggered cube arrays. For understanding the influence of the wall permeability on turbulence, DNS of an impermeable rough walled channel flow is also conducted. By two-point auto correlation, one-dimensional energy spectrum and proper orthogonal decomposition (POD) analyses, the existence and characteristics of the transverse pressure waves induced by the Kelvin-Helmholtz (K-H) instability over the porous and rough walls are elucidated. The structure, wave lengths and power spectra of the transverse waves are discussed in detail. The influence of the K-H instability on turbulence is also clarified. (C) 2016 Elsevier Inc. All rights reserved.
DOI	10.1016/j.ijheatfluidflow.2016.03.006
ISSN	0142-727X/1879-2278
Put Code(ORCID)	23559750
PermalinkURL	http://orcid.org/0000-0001-9313-1816