Print Email Facebook Twitter Self-Sustained Localized Structures in a Boundary-Layer Flow Title Self-Sustained Localized Structures in a Boundary-Layer Flow Author Duguet, Y. Schlatter, P. Henningson, D.S. Eckhardt, B.E. Faculty Mechanical, Maritime and Materials Engineering Department Process and Energy Date 2012-01-25 Abstract When a boundary layer starts to develop spatially over a flat plate, only disturbances of sufficiently large amplitude survive and trigger turbulence subcritically. Direct numerical simulation of the Blasius boundary-layer flow is carried out to track the dynamics in the region of phase space separating transitional from relaminarizing trajectories. In this intermediate regime, the corresponding disturbance is fully localized and spreads slowly in space. This structure is dominated by a robust pair of low-speed streaks, whose convective instabilities spawn hairpin vortices evolving downstream into transient disturbances. A quasicyclic mechanism for the generation of offspring is unfolded using dynamical rescaling with the local boundary-layer thickness. To reference this document use: http://resolver.tudelft.nl/uuid:c7c855b5-90d3-4b16-934d-5f191e8a3f2a DOI https://doi.org/10.1103/PhysRevLett.108.044501 Publisher American Physical Society ISSN 0031-9007 Source http://link.aps.org/doi/10.1103/PhysRevLett.108.044501 Source Physical Review Letters, 108 (4), 2012 Part of collection Institutional Repository Document type journal article Rights (c) 2012 The Author(s)American Physical Society Files PDF PhysRevLett.108.0445011.pdf 457.7 KB Close viewer /islandora/object/uuid:c7c855b5-90d3-4b16-934d-5f191e8a3f2a/datastream/OBJ/view