JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
64237017.pdf1.46 MB
title周期的急拡大管流れの遷移と対流不安定性
Other TitleTransition and convective instability of flow in a symmetric channel with spatially periodic structures
Author(jpn)水島, 二郎; 高岡, 正憲; 山本, 寿一; 佐野, 太郎
Author(eng)Mizushima, Jiro; Takaoka, Masanori; Yamamoto, Hisakazu; Sano, Taro
Author Affiliation(jpn)同志社大学大学院工学研究科; 同志社大学大学院工学研究科; 同志社大学大学院工学研究科; 同志社大学大学院工学研究科
Author Affiliation(eng)Department of Mechanical Engineering, Graduate School of Engineering, Doshisha University; Department of Mechanical Engineering, Graduate School of Engineering, Doshisha University; Department of Mechanical Engineering, Graduate School of Engineering, Doshisha University; Department of Mechanical Engineering, Graduate School of Engineering, Doshisha University
Issue Date2009-02-27
PublisherJapan Aerospace Exploration Agency (JAXA)
宇宙航空研究開発機構
Publication titleJAXA special publication: Proceedings of the 41st and 42nd JAXA Workshops on Investigation and Control of Boundar-Layer Transition
宇宙航空研究開発機構特別資料: 境界層遷移の解明と制御研究会講演論文集(第41回・第42回)
VolumeJAXA-SP-08-006
Publication date2009-02-27
Languagejpn
eng
AbstractTransition and convective instability of flow in a two-dimensional symmetric channel with periodic suddenly expanded sections is investigated numerically and experimentally. The flow is found to deflect in the opposite side in every pair of adjacent expanded sections due to a pitchfork bifurcation and has a spatial period twice the periodicity of the channel geometry. Adding a localized disturbance at the inlet of the channel, the subsequent spatiotemporal development of the disturbance is observed. The disturbance induces two localized packet-like waves, one of which travels downstream reversing each deflection direction in expanded sections, and the other localized wave travels downstream forming a wave-packet. It is found that the wave-packet always splits into two intrinsic waves propagating with distinct phase velocities. The spatial structure and the phase velocity of the intrinsic waves are compared with the eigen mode of stability under two different periodic boundary conditions, one of which imposes the flow to have the same periodic length with that of the channel geometry and the other twice the periodic length together with a shift-and-reflect symmetry.
Description会議: 第42回「境界層遷移の解明と制御」研究会(2008年3月31日-4月1日)
Keywordssymmetric channel, periodic sudden expansions, bifurcation, convective stability
Document TypeTechnical Report
JAXA Category特別資料
ISSN1349-113X
NCIDAA11984031
SHI-NOAA0064237017
Report NoJAXA-SP-08-006
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/13557


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