Three-dimensional global linear stability analysis of flow around a spheroid

Asei Tezuka, Kojiro Suzuki

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Computational study of flowfields around a spheroid at varied angles of attack is done using China's method, which is one of the methods of three-dimensional global linear stability analysis. It is clarified that in the case of a spheroid, nonoscillatory, nonaxisymmetric flow (in the case of zero angle of attack) and nonoscillatory asymmetric flow (in the case of nonzero angle of attack) are observed in a range of the freestream Reynolds number around 4 × 103 to 7 × 103, and angle of attack from 0 to 30 deg. The amplification factor of the nonoscillatory asymmetric (or nonaxisymmetric in 0-deg attack angle case) mode is the largest The transition from nonoscillatory symmetric (or axisymmetric) flow, to nonoscillatory asymmetric (or nonaxisymmetric) flow, occurs when the amplification factor becomes zero. To ascertain the appearance of the nonoscillatory asymmetric flow in an attack angle case, a low-speed wind tunnel experiment was also conducted. The picture of flow visualization shows an asymmetric pattern when the Reynolds number is around 6.5 × 10 3, whereas the pattern is symmetric at a Reynolds number around 3.5 × 103.

Original languageEnglish
Pages (from-to)1697-1708
Number of pages12
JournalAIAA Journal
Volume44
Issue number8
DOIs
Publication statusPublished - 2006 Aug 1

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ASJC Scopus subject areas

  • Aerospace Engineering

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