Analysis of vortical gust impact on airfoils at low Reynolds number

Martínez Muriel, Cayetano; Flores Arias, Óscar

Publication:
Analysis of vortical gust impact on airfoils at low Reynolds number

dc.affiliation.dpto	UC3M. Departamento de Ingeniería Aeroespacial	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Ingeniería Aeroespacial	es
dc.contributor.author	Martínez Muriel, Cayetano
dc.contributor.author	Flores Arias, Óscar
dc.contributor.funder	Ministerio de Economía y Competitividad (España)	es
dc.date.accessioned	2021-05-25T11:12:54Z
dc.date.available	2022-11-01T00:00:06Z
dc.date.issued	2020-11
dc.description.abstract	The response of a NACA0012 airfoil impacted by vortical gusts is investigated perform-ing Direct Numerical Simulations of the two-dimensional incompressible flow. Taylorvortices of different diameter and intensity located at different vertical separationswith respect to the airfoil are deployed in the free stream. These vortices, which arecharacterized by its compact distribution of vorticity, are advected downstream tointeract with the airfoil, set at a fixed angle of attack. For the low Reynolds numberused in these simulations (Re=1000), the effect of the different parameters definingthe vortical gust and the impact is characterized. It is found that the change in thetime evolution of the variation of the lift coefficient with respect to the steady state,∆Cl(t), is fairly independent on the angle of attack, at least in the range ofαconsideredin this study. Furthermore, it is found that the time at which the peak in∆Clisproduced scales with the diameter of the viscous core of the vortex and the free-streamvelocity,D/U∞. On the other hand, the maximum value of∆Clis roughly proportionalto the non-dimensional vortex circulation, but varies non-linearly with the verticaldistance between the vortex and the airfoil. This dependency can be captured by scaling∆Clwith the relative intensity of the vertical velocity induced over the airfoil andthe free-stream velocity (wh/U∞), where the former is defined as an integral of thevortex velocity profile over the chord of the airfoil. Using this scaling, the profiles of∆Cl(tU∞/D)/(wh/U∞) collapse over a single curve for the different vortex intensities,sizesandverticalseparationsconsideredinthepresentstudy,speciallyduringtheinitialevolution of the vortical gust impact. The self-similar profile of∆Cl(tU∞/D)/(wh/U∞) isfound to depend on the velocity profile of the vortex (i.e., Taylor vortices versus Lamb–Oseenvortices).However,thepeakaerodynamicforceandthetimetopeakaerodynamicforce seem to scale withD/U∞andwh/U∞irrespective of the velocity profile of thevortex, suggesting that our definition ofwhis sufficiently robust.	en
dc.format.extent	15
dc.identifier.bibliographicCitation	Martínez-Muriel, C. & Flores, O. (2020). Analysis of vortical gust impact on airfoils at low Reynolds number. Journal of Fluids and Structures, vol. 99, 103138.	en
dc.identifier.doi	10.1016/j.jfluidstructs.2020.103138
dc.identifier.issn	0889-9746
dc.identifier.publicationfirstpage	103138
dc.identifier.publicationtitle	Journal of Fluids and Structures	en
dc.identifier.publicationvolume	99
dc.identifier.uri	https://hdl.handle.net/10016/32746
dc.identifier.uxxi	AR/0000026206
dc.language.iso	eng
dc.publisher	Elsevier	en
dc.relation.projectID	Gobierno de España. DPI2016-76151-C2-2-R	es
dc.rights	© 2020 Elsevier Ltd.	en
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 España	*
dc.rights.accessRights	open access
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/es/	*
dc.subject.eciencia	Ingeniería Naval	es
dc.subject.other	Vortical gust response	en
dc.subject.other	Unsteady aerodynamics	en
dc.title	Analysis of vortical gust impact on airfoils at low Reynolds number	en
dc.type	research article	*
dc.type.hasVersion	AM	*
dspace.entity.type	Publication