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dc.contributor.authorRodríguez-García, Jesús Óscar
dc.contributor.authorBlanco-Rodríguez, Francisco José
dc.contributor.authorParras-Anguita, Luis 
dc.contributor.authorDel-Pino-Peñas, Carlos Manuel 
dc.date.accessioned2016-09-19T09:45:05Z
dc.date.available2016-09-19T09:45:05Z
dc.date.created2016
dc.date.issued2016-09-19
dc.identifier.urihttp://hdl.handle.net/10630/12035
dc.description.abstractWingtip vortices represent a hazard for the stability of the following airplane in airport highways. These flows have been usually modeled as swirling jets/wakes, which are known to be highly unstable and susceptible to breakdown at high Reynolds numbers for certain flow conditions, but different to the ones present in real flying airplanes. A very recent study based on Direct Numerical Simulations (DNS) shows that a large variety of helical responses can be excited and amplified when a harmonic inlet forcing is imposed. In this work, the optimal response of q-vortex (both axial vorticity and axial velocity can be modeled by a Gaussian profile) is studied by considering the time-harmonically forced problem with a certain frequency ω. We first reproduce Guo and Sun’s results for the Lamb-Oseen vortex (no axial flow) to validate our numerical code. In the axisymmetric case m = 0, the system response is the largest when the input frequency is null. The axial flow has a weak influence in the response for any axial velocity intensity. We also consider helical perturbations |m| = 1. These perturbations are excited through a resonance mechanism at moderate and large wavelengths as it is shown in Figure 1. In addition, Figure 2 shows that the frequency at which the optimal gain is obtained is not a continuous function of the axial wavenumber k. At smaller wavelengths, large response is excited by steady forcing. Regarding the axial flow, the unstable response is the largest when the axial velocity intensity, 1/q, is near to zero. For perturbations with higher azimuthal wavenumbers |m| > 1, the magnitudes of the response are smaller than those for helical modes. In order to establish an alternative validation, DNS has been carried out by using a pseudospectral Fourier formulation finding a very good agreement.es_ES
dc.description.sponsorshipUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.es_ES
dc.language.isoenges_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectMecánica de fluidoses_ES
dc.subject.otherWingtip vortexes_ES
dc.subject.otherVortex flowes_ES
dc.subject.otherBatchelor modeles_ES
dc.titleOn the optimaL response of q-vortexes_ES
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.centroE.T.S.I. Industriales_ES
dc.relation.eventtitleEFMC11 – 11th European Fluid Mechanics Conferencees_ES
dc.relation.eventplaceSevilla, Españaes_ES
dc.relation.eventdate12/09/2016es_ES
dc.identifier.orcidhttp://orcid.org/0000-0002-9793-5253es_ES
dc.cclicenseby-nc-ndes_ES


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