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Article overview
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Localized travelling waves in the asymptotic suction boundary layer | Tobias Kreilos
; John F. Gibson
; Tobias M. Schneider
; | Date: |
2 May 2016 | Abstract: | We present two spanwise-localized travelling wave solutions in the asymptotic
suction boundary layer, obtained by continuation of solutions of plane Couette
flow. One of the solutions has the vortical structures located close to the
wall, similar to spanwise-localized edge states previously found for this
system. The vortical structures of the second solution are located in the free
stream far above the laminar boundary layer and are supported by a secondary
shear gradient that is created by a large-scale low-speed streak. The
dynamically relevant eigenmodes of this solution are concentrated in the free
stream, and the departure into turbulence from this solution evolves in the
free stream towards the walls. For invariant solutions in free-stream
turbulence, this solution thus shows that that the source of energy of the
vortical structures can be a dynamical structure of the solution itself,
instead of the laminar boundary layer. | Source: | arXiv, 1605.0494 | Services: | Forum | Review | PDF | Favorites |
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