TY - JOUR
T1 - Evolution of disturbance wavepackets in an oscillatory Stokes layer
AU - Thomas, Christian
AU - Davies, Christopher
AU - Bassom, Andrew P.
AU - Blennerhassett, P. J.
PY - 2014/8/10
Y1 - 2014/8/10
N2 - 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.
AB - 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.
KW - absolute/convective instability
KW - boundary layer stability
KW - transition to turbulence
UR - http://www.scopus.com/inward/record.url?scp=84924412110&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/DP0880463
U2 - 10.1017/jfm.2014.291
DO - 10.1017/jfm.2014.291
M3 - Article
AN - SCOPUS:84924412110
SN - 0022-1120
VL - 752
SP - 543
EP - 571
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
ER -