Vortex dynamics and scalar transport in the wake of a flat-plate controlled by a vibrating trailing-edge flap
Author
dc.contributor.author
Hernández Pellicer, Rodrigo
Author
dc.contributor.author
Tapia, L.
Admission date
dc.date.accessioned
2020-05-18T15:31:47Z
Available date
dc.date.available
2020-05-18T15:31:47Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
International Journal of Heat and Fluid Flow 81 (2020) 108526
es_ES
Identifier
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10.1016/j.ijheatfluidflow.2019.108526
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/174783
Abstract
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We investigate the onset and development of vortical flow disturbances introduced into the wake of a horizontally fixed flat-plate by means of the controlled motion of a trailing edge flap. The vibrating mechanics of the flap allows for the introduction of both impulsive and harmonic weak amplitude velocity disturbances which are propagated downstream into the wake flow of the flat-plate. Quantitative experimental and numerical predictions of both steady and unsteady wake flow velocity resulting from different flapping frequencies are made at low Reynolds numbers (Re < 10(4)). Frequency response tests of the wake confirmed the existence of two dominant frequencies where the wake flow organises with a particular arrangement of downstream moving vortex structures. Numerical predictions of steady (unforced) and forced wake velocity profiles and kinetic energy profiles are in good agreement with the experimental results. In order to understand practical implications of the dominant vortex structures in scalar transport, we have extended the numerical part of the study solving for the concentration equation of a passive scalar being injected in particular regions of the physical domain. A spatial correlation between the trajectory of vortex structures and the scalar concentration downstream the wake is observed. Moreover, the onset of tip vortex structures produced during the forcing cycle seems to be responsible of a local increase of scalar concentration near the span wise flap ends.