A numerical study of the flow around a model winged seed in auto-rotation

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dc.contributor.author Arranz Fernández, Gonzalo
dc.contributor.author Gonzalo Grande, Alejandro
dc.contributor.author Uhlmann, Markus
dc.contributor.author Flores Arias, Óscar
dc.contributor.author García-Villalba Navaridas, Manuel
dc.date.accessioned 2020-04-15T14:03:37Z
dc.date.available 2020-04-15T14:03:37Z
dc.date.issued 2018-07-16
dc.identifier.bibliographicCitation Flow, Turbulence and Combustion, (2018), vol. 101, pp. 477–497.
dc.identifier.issn 1386-6184
dc.identifier.uri http://hdl.handle.net/10016/30125
dc.description.abstract In this study the flow around a winged-seed in auto-rotation is characterized using direct numerical simulations (DNS) at Reynolds number in the range 80-240, based on the descent speed and a characteristic chord length. In this range, the flow is approximately steady when observed from a reference frame fixed to the seed. For all cases, the flow structure consists of a wing tip vortex which describes a helical path, a vortex shed behind the nut of the seed and a stable leading edge vortex above the wing surface which merges with the tip vortex. With increasing Reynolds number, the leading edge vortex becomes more intense and gets closer to the wing surface. The simulation results also show the formation of a spanwise flow on the upper surface of the wing, moving fluid towards the wing tip in a region downstream and beneath the leading edge vortex. This spanwise flow is rather weak inside the core of the leading edge vortex, and the analysis of the streamlines show a very weak transport of vorticity along the vortex for the cases under consideration. The analysis of the flow suggests that the stabilization of the leading edge vortex is mainly due to non-inertial accelerations, although viscous effects may contribute, specially at lower Re. Furthermore, the leading edge vortex has been characterized by analysing the flow variables averaged along cross-sections of the vortex. While some quantities, like the spanwise velocity or the pressure inside the vortex, are rather insensitive to the threshold used to define the leading edge vortex, the same is not true for the circulation of the vortex or its averaged spanwise vorticity, due to the viscous nature of the vortex. Finally, it is observed that the spanwise vorticity scales with the angular rotation of the seed for the different Re.
dc.description.sponsorship This work was supported by grants TRA2013-41103-P (Mineco/Feder UE) and DPI2016-76151-C2-2-R (AEI/ Feder UE). MGV was partially supported by a grant of the BBVA Foundation. The code was partially developed during a stay of MGV (funded by the Spanish Ministry of Education through the program José Castillejo) at the Karlsruhe Institute of Technology. The simulations were partially performed at the Steinbuch Centre for Computing (SCC), Karlsruhe.
dc.format.extent 20
dc.language.iso eng
dc.publisher Springer
dc.rights © 2018, Springer Nature
dc.subject.other Direct numerical simulation
dc.subject.other Auto-rotation
dc.subject.other Leading edge vortex
dc.title A numerical study of the flow around a model winged seed in auto-rotation
dc.type article
dc.description.status Publicado
dc.subject.eciencia Aeronáutica
dc.identifier.doi https://doi.org/10.1007/s10494-018-9945-z
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. TRA2013-41103-P
dc.relation.projectID Gobierno de España. DPI2016-76151-C2-2-R
dc.type.version submittedVersion
dc.identifier.publicationfirstpage 477
dc.identifier.publicationlastpage 497
dc.identifier.publicationtitle Flow, Turbulence and Combustion
dc.identifier.publicationvolume 101
dc.identifier.uxxi AR/0000022253
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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