Algebraic instability caused by acoustic modes in supersonic shear flows
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- Hirota, Makoto
- Japan Atomic Energy Agency
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- Yoshida, Zensho
- Graduate School of Frontier Sciences, University of Tokyo
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Abstract
Perturbations in a shear flow exhibit rather complex behavior - waves may grow algebraically even when the spectrum of disturbances is entirely neutral (no exponential instability). A shear flow brings about non-selfadjoint property, invalidating the standard notion of dispersion relations, and it also produces a continuous spectrum that is a characteristic entity in an infinite-dimension phase space. This paper solves an initial value problem using the Laplace transform and presents a new-type of algebraic instability that is caused by resonant interaction between acoustic modes (point spectrum) and vortical continuum mode (continuous spectrum). Such a resonance is possible when variation of velocity shear is comparable to sound speed.
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Journal
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- Journal of Math-for-Industry (JMI)
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Journal of Math-for-Industry (JMI) 1 (B), 123-130, 2009-10-16
Faculty of Mathematics, Kyushu University
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Details 詳細情報について
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- CRID
- 1050861482659051648
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- NII Article ID
- 120001633481
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- NII Book ID
- AA12444018
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- ISSN
- 18844774
- 18844782
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- HANDLE
- 2324/15586
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- NDL BIB ID
- 10948678
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- NDL
- CiNii Articles