Adverse-Pressure-Gradient Effects on Turbulent Boundary Layers: Statistics and Flow-Field Organization

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Show simple item record Sanmiguel Vila, Carlos Orlu, Ramis Vinuesa, Ricardo Schlatter, Philipp Christian Ianiro, Andrea Discetti, Stefano 2021-02-22T09:38:04Z 2021-02-22T09:38:04Z 2017-12-01
dc.identifier.bibliographicCitation Sanmiguel Vila, C., Örlü, R., Vinuesa, R., Schlatter, P., Ianiro, A. y Discetti, S.(2017). Adverse-Pressure-Gradient Effects on Turbulent Boundary Layers: Statistics and Flow-Field Organization. Flow Turbulence Combust, 99, pp. 589–612.
dc.identifier.issn 1386-6184
dc.description.abstract This manuscripts presents a study on adverse-pressure-gradient turbulent boundary layers under different Reynolds-number and pressure-gradient conditions. In this work we performed Particle Image Velocimetry (PIV) measurements supplemented with Large-Eddy Simulations in order to have a dataset covering a range of displacement-thickness-based Reynolds-number 2300 34000 and values of the Clauser pressure-gradient parameter beta up to 2.4. The spatial resolution limits of PIV for the estimation of turbulence statistics have been overcome via ensemble-based approaches. A comparison between ensemble-correlation and ensemble Particle Tracking Velocimetry was carried out to assess the uncertainty of the two methods. The effects of beta, R e and of the pressure-gradient history on turbulence statistics were assessed. A modal analysis via Proper Orthogonal Decomposition was carried out on the flow fields and showed that about 20% of the energy contribution corresponds to the first mode, while 40% of the turbulent kinetic energy corresponds to the first four modes with no appreciable dependence on beta and R e within the investigated range. The topology of the spatial modes shows a dependence on the Reynolds number and on the pressure-gradient strength, in line with the results obtained from the analysis of the turbulence statistics. The contribution of the modes to the Reynolds stresses and the turbulence production was assessed using a truncated low-order reconstruction with progressively larger number of modes. It is shown that the outer peaks in the Reynolds-stress profiles are mostly due to large-scale structures in the outer part of the boundary layer.
dc.description.sponsorship CSV acknowledges the financial support from Universidad Carlos III de Madrid within the program “Ayudas para la Movilidad del Programa Propio de Investigación”. RÖ, RV and PS acknowledge the financial support from the Swedish Research Council (VR) and the Knut and Alice Wallenberg Foundation. CSV, SD and AI were partially supported by the COTURB project (Coherent Structures in Wall-bounded Turbulence), funded by the European Research Council (ERC), under grant ERC-2014.AdG-669505. CSV, SD and AI have been partially supported by Grant DPI2016-79401-R funded by the Spanish State Research Agency (SRA) and European Regional Development Fund (ERDF).
dc.format.extent 24
dc.language.iso eng
dc.publisher Springer
dc.rights © 2017, The Author(s).
dc.rights Atribución 3.0 España
dc.subject.other PTV
dc.subject.other POD
dc.subject.other PIV
dc.subject.other Wall turbulence
dc.title Adverse-Pressure-Gradient Effects on Turbulent Boundary Layers: Statistics and Flow-Field Organization
dc.type article
dc.subject.eciencia Aeronáutica
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. DPI2016-79401-R
dc.relation.projectID info:eu-repo/grantAgreement/ERC/2014/ADG/669505
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 589
dc.identifier.publicationissue 3-4
dc.identifier.publicationlastpage 612
dc.identifier.publicationtitle Flow, Turbulence and Combustion
dc.identifier.publicationvolume 99
dc.identifier.uxxi AR/0000020859
dc.contributor.funder European Commission
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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