Evolution of disturbance wavepackets in an oscillatory Stokes layer

Christian Thomas; Christopher Davies; Andrew P. Bassom; P. J. Blennerhassett

doi:10.1017/jfm.2014.291

Evolution of disturbance wavepackets in an oscillatory Stokes layer

Christian Thomas, Christopher Davies, Andrew P. Bassom, P. J. Blennerhassett

Research output: Contribution to journal › Article › Research › peer-review

13 Citations (Scopus)

Abstract

Numerical simulation results are presented for the linear and nonlinear evolution of disturbances in a flat Stokes layer. The response to a spatially localised impulsive forcing is investigated and it is found that the spatial-temporal development of the flow displays an intriguing family-tree-like structure, which involves the birth of successive generations of distinct wavepacket components. It is shown that some features of this unexpected structure can be predicted using the results of a linear stability analysis based on Floquet theory.

Original language	English
Pages (from-to)	543-571
Number of pages	29
Journal	Journal of Fluid Mechanics
Volume	752
DOIs	https://doi.org/10.1017/jfm.2014.291
Publication status	Published - 10 Aug 2014
Externally published	Yes

Keywords

boundary layer stability
Key words absolute/convective instability
transition to turbulence

Access to Document

10.1017/jfm.2014.291

35451592-oaFinal published version, 21.8 MB

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Cite this

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