Sound And Sources Of Sound In A Model Problem With Wake Interaction

dc.creatorWolf
dc.creatorWilliam R.; Cavalieri
dc.creatorAndre V. G.; Backes
dc.creatorBruno; Morsch-Flho
dc.creatorEdemar; Azevedo
dc.creatorJoao L. F.
dc.date2015-SEP
dc.date2016-06-07T13:21:13Z
dc.date2016-06-07T13:21:13Z
dc.date.accessioned2018-03-29T01:41:06Z
dc.date.available2018-03-29T01:41:06Z
dc.identifier
dc.identifierSound And Sources Of Sound In A Model Problem With Wake Interaction. Amer Inst Aeronautics Astronautics, v. 53, p. 2588-2606 SEP-2015.
dc.identifier0001-1452
dc.identifierWOS:000359983400013
dc.identifier10.2514/1.J053713
dc.identifierhttp://arc.aiaa.org/doi/abs/10.2514/1.J053713
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/243046
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1306744
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionAeroacoustic predictions of a model airframe noise problem are conducted to assess the effects of wake interaction on flow and acoustic fields. Simulations of unsteady low Reynolds number flows, including both noise generation and its subsequent propagation to the far field, are performed for a configuration composed of a cylinder placed above a NACA 0012 airfoil. An assessment of cylinder position and freestream Mach number effects on sound radiation is presented. It is observed that intense interference among cylinder and airfoil dipoles occurs for all configurations analyzed. In this case, each body scatters the sound emitted by the other. For moderate Mach number flows with wake interaction, quadrupole sources become important to the total acoustic prediction, specially for the downward noise radiation. In order to investigate how wake interaction affects noise radiation, a comparison between the current model problem with a single cylinder case is presented. Results show that wake interaction becomes a major feature of the airfoil-cylinder flow, causing a faster downstream decay of convecting disturbances when compared to the isolated cylinder case. This issue is further studied using a linear stability calculation for the wake interaction problem, which shows that for higher Mach numbers, compressibility effects lead to the formation of a wave-packet structure in the wake with higher maximum amplitude, higher convection Mach number and a sudden spatial decay. Therefore, wake interaction and compressibility effects play a key role in the present model problem and are proposed as responsible for the increase of quadrupole noise radiation.
dc.description53
dc.description9
dc.description
dc.description2588
dc.description2606
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionPro-Reitoria de Pesquisa of Univerisity of Campinas, PRP-UNICAMP
dc.descriptionCENAPAD-SP [551]
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFAPESP [2013/03413-4, 2013/07375-0]
dc.description
dc.description
dc.description
dc.languageen
dc.publisherAMER INST AERONAUTICS ASTRONAUTICS
dc.publisher
dc.publisherRESTON
dc.relationAIAA JOURNAL
dc.rightsfechado
dc.sourceWOS
dc.subjectAdverse Pressure-gradient
dc.subjectFast Multipole Method
dc.subjectQuadrupole Sources
dc.subjectAerodynamic Sound
dc.subjectFlow
dc.subjectAirfoil
dc.subjectNoise
dc.subjectGeneration
dc.subjectAnalogy
dc.subjectNumbers
dc.titleSound And Sources Of Sound In A Model Problem With Wake Interaction
dc.typeArtículos de revistas


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