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Advanced statistical analysis of the collision of wall jet with a boundary layer

2015-08-09Journal article Embargoed access
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dc.contributor.authorSilva, André
dc.contributor.authorPanão, Miguel
dc.contributor.authorBarata, Jorge M M
dc.date.accessioned2022-04-04T13:26:52Z
dc.date.embargo2060-08-09
dc.date.issued2015-08-09
dc.description.abstractLaser-Doppler measurements of the velocity characteristics of a ground vortex flow resulting from the collision of a wall jet with a boundary layer are analyzed using advanced statistical tools. Namely, finite mixtures of probability density functions, which determine the best fitting using a Bayesian approach based on a Markov Chain Monte Carlo (MCMC) algorithm. This approach takes into account eventual multimodality and heterogeneities in velocity field distributions. Therefore, it provides more complete information about the probability density function of multimodal velocity distributions and allows the identification of characteristic velocities in the heterogeneous data. The experiments are performed for a wall jet-to-boundary layer velocity ratio of 2, and include mean and turbulent velocity characteristics along the two normal directions contained in planes parallel to the nozzle axis. The results, which have relevance to flows encountered by VSTOL aircraft, quantify the structure of the complex ground vortex flow. The results revealed that in the collision zone the rms velocity fluctuation appears to be overestimated for the horizontal component, probably due to the measured velocity range, oscillating between positive and negative values. The results revealed that finite mixture was able to accurately reconstruct a mathematical function describing the probability distribution obtained experimentally. The results shows that U and u'rms rms provide an idea of the flow dynamics, their use is limited and an important amount of information associated with the highly curved flow complexity is lost, preventing a more accurate description of turbulent structures emerging from the collision of wall jet with a boundary layer.pt_PT
dc.description.sponsorshipFundação para a Ciência e a Tecnologiapt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAndré Silva, Miguel Panão, Jorge Barata Advanced Statistical Analysis of the Collision of Wall Jet with a Boundary Layer First Thermal and Fluids Engineering Summer Conference (TFESC), New York, NY, EUA, 9-12 agosto, 2015 DOI: 10.1615/TFESC1.asp.012935pt_PT
dc.identifier.doi10.1615/TFESC1.asp.012935pt_PT
dc.identifier.isbn978-1-56700-431-1
dc.identifier.isbn978-1-56700-430-4
dc.identifier.issn23791748
dc.identifier.urihttp://hdl.handle.net/10400.6/12177
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherBegell Housept_PT
dc.relation.publisherversionhttps://dl.astfe.org/conferences/tfesc,388f83a76eacafc2,5ff204293cb494c5.htmlpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectVSTOLpt_PT
dc.subjectGround Vortexpt_PT
dc.subjectWall Jetpt_PT
dc.subjectBoundary Layerpt_PT
dc.subjectStatistical Analysispt_PT
dc.subjectFinite Mixturespt_PT
dc.subjectBayesian Approachpt_PT
dc.subjectMarkov Chain Monte Carlopt_PT
dc.titleAdvanced statistical analysis of the collision of wall jet with a boundary layerpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceNew York City, USApt_PT
oaire.citation.endPage163pt_PT
oaire.citation.startPage151pt_PT
oaire.citation.titleFirst Thermal and Fluids Engineering Summer Conferencept_PT
person.familyNameResende Rodrigues da Silva
person.familyNamePanão
person.familyNameMartins Barata
person.givenNameAndré
person.givenNameMiguel Rosa Oliveira
person.givenNameJorge Manuel
person.identifierJ-4185-2012
person.identifiertnDRoxYAAAAJ
person.identifierhFY_5JYAAAAJ&hl
person.identifier.ciencia-id8219-4B2B-E1C7
person.identifier.ciencia-id181F-16AE-4536
person.identifier.ciencia-idF611-BBCC-DAA8
person.identifier.orcid0000-0002-4901-7140
person.identifier.orcid0000-0001-9561-9268
person.identifier.orcid0000-0001-9014-5008
person.identifier.scopus-author-id11440407500
person.identifier.scopus-author-id8900941900
person.identifier.scopus-author-id11439470600
rcaap.embargofctFundação para a Ciência e a Tecnologiapt_PT
rcaap.rightsembargoedAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscovery1bcdeaa7-6e37-473d-a9d5-f7f2d0b0eead

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