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Three-dimensional inviscid waves in buoyant boundary layer flows
journal contribution
posted on 2023-05-18, 17:48 authored by Denier, JP, Stott, JAK, Andrew BassomAndrew BassomThe stability of weakly three-dimensional buoyancy-driven boundary layers to travelling waves is considered. It is shown that in the absence of crossflow inviscid modes are unstable and, as the degree of crossflow is increased, the short waves are the first to be stabilised – longer waves require an enhanced level of three-dimensionality of the basic flow for stabilisation. A combination of asymptotic and numerical techniques are used to provide a complete description of the inviscid modes over the whole wavenumber spectrum. The study is also extended to consider pure vortex “roll-cell” modes which can exist within unstably stratified (buoyancy driven) flows and these are found to stabilise in the presence of crossflow.
History
Publication title
Fluid Dynamics ResearchVolume
28Pagination
89-109ISSN
0169-5983Department/School
School of Natural SciencesPublisher
Elsevier BVPlace of publication
Amsterdam, NetherlandsRepository Status
- Restricted