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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Instability of isolated compressible entropy-stratified vortices

http://hdl.handle.net/2237/7085
http://hdl.handle.net/2237/7085
86fef55e-da8d-456e-a48d-3b1307c1c158
名前 / ファイル ライセンス アクション
PhysFluids_17_034102.pdf PhysFluids_17_034102.pdf (2.1 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2006-10-26
タイトル
タイトル Instability of isolated compressible entropy-stratified vortices
言語 en
著者 Men’shov, Igor

× Men’shov, Igor

WEKO 14133

en Men’shov, Igor

Search repository
Nakamura, Yoshiaki

× Nakamura, Yoshiaki

WEKO 14134

en Nakamura, Yoshiaki

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 copyright (2005) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
抄録
内容記述 The normal mode linear analysis is applied to investigate the stability of a circular isolated compressible vortex with the emphasis on studying the effect of entropy stratification of the basic flow on stability properties. We study a family of vortices that have zero total circulation, with the swirl velocity being presented by a Taylor-type distribution in the radial direction. The stratification of entropy is modeled by a Gaussian two-parametric profile whose parameters control the maximal deviation from the homentropic distribution and the extent of the entropic zone. Results presented concern the effect of these parameters and the vortex intensity on instability characteristics. In particular, in the case of homentropic flow, vortices considered are found to be stable only for sufficiently high intensities and cease to be stable as the intensity weakens. As an example of the situation where unstable normal modes can be excited, the scattering of sound waves by the vortex flow is considered. By simulating this process numerically, we show that the scattered field becomes unstable in the course of time and acquires a typical periodical pattern in polar angle. The characteristics of this instability (viz., the growth rate and the azimuthal phase frequency)coincide with those of the linear analysis very closely. This fact shows conclusively that the instability is caused by the induction of unstable normal modes in the vortex by means of sound irradiation.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 American Institute of Physics
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1063/1.1851451
ISSN
収録物識別子タイプ PISSN
収録物識別子 1070-6631
書誌情報 en : Physics of Fluids

巻 17, 号 3, p. 034102-034102, 発行日 2005-01
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/7085
識別子タイプ HDL
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