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Nonlinear synchronization in open flows

delete2001-04-01
delete20
delete
OA
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B
Benoı̂t Pier *
P
Patrick Huerre
DOI：10.1006/jfls.2000.0349delete
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Abstract

Abstract

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The selection criteria governing finite-amplitude synchronized oscillating states are discussed for model systems and real wake flows in a domain of infinite streamwise extent. Two types of nonlinear global modes are possible: hat modes with overall smoothly varying amplitude and elephant modes with a sharp front. The vortex street in wake flows is of elephant type, as observed in direct numerical simulations of a real spatially developing wake. Furthermore, the elephant frequency selection criterion is in excellent agreement with the numerically determined vortex shedding frequency. (C) 2001 Academic Press.
Keywords:
BENARD-VONKARMAN INSTABILITY
SPATIALLY DEVELOPING FLOWS
GLOBAL MODES
DEVELOPING MEDIA
SELECTION
STABILITY
DYNAMICS
WAKES
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Journal

Journal of Fluids and Structures cover
Journal of Fluids and Structures
IF:
3.5
Papers:
3.7K
Citations:
1.2W

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