A turbulent boundary layer over a two-dimensional rough wall
Identifieur interne : 008F02 ( Main/Exploration ); précédent : 008F01; suivant : 008F03A turbulent boundary layer over a two-dimensional rough wall
Auteurs : Lyazid Djenidi [Australie] ; Robert A. Antonia [Australie] ; Muriel Amielh [France] ; Fabien Anselmet [France]Source :
- Experiments in fluids [ 0723-4864 ] ; 2008.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
Particle image velocimetry (PIV) measurements and planar laser induced fluorescence (PLIF) visualizations have been made in a turbulent boundary layer over a rough wall. The wall roughness consisted of square bars placed transversely to the flow at a pitch to height ratio of λ/k = 11 for the PLIF experiments and λ/κ = 8 and 16 for the PIV measurements. The ratio between the boundary layer thickness and the roughness height k/δ was about 20 for the PLIF and 38 for the PIV. Both the PLIF and PIV data showed that the near-wall region of the flow was populated by unstable quasi-coherent structures which could be associated to shear layers originating at the trailing edge of the roughness elements. The streamwise mean velocity profile presented a downward shift which varied marginally between the two cases of i/k, in agreement with previous measurements and DNS results. The data indicated that the Reynolds stresses normalized by the wall units are higher for the case λ/k = 16 than those for λ/k = 8 in the outer region of the flow, suggesting that the roughness density effects could be felt well beyond the near-wall region of the flow. As expected the roughness disturbed dramatically the sublayer which in turn altered the turbulence production mechanism. The turbulence production is maximum at a distance of about 0.5k above the roughness elements. When normalized by the wall units, the turbulence production is found to be smaller than that of a smooth wall. It is argued that the production of turbulence is correlated with the form drag.
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Antonia</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>School of Engineering, University of Newcastle</s1><s2>Newcastle</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Newcastle</wicri:noRegion></affiliation></author><author><name sortKey="Amielh, Muriel" sort="Amielh, Muriel" uniqKey="Amielh M" first="Muriel" last="Amielh">Muriel Amielh</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>IRPHE</s1><s2>Marseille</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Provence-Alpes-Côte d'Azur</region><region type="old region">Provence-Alpes-Côte d'Azur</region><settlement type="city">Marseille</settlement></placeName></affiliation></author><author><name sortKey="Anselmet, Fabien" sort="Anselmet, Fabien" uniqKey="Anselmet F" first="Fabien" last="Anselmet">Fabien Anselmet</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>IRPHE</s1><s2>Marseille</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Provence-Alpes-Côte d'Azur</region><region type="old region">Provence-Alpes-Côte d'Azur</region><settlement type="city">Marseille</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Experiments in fluids</title><title level="j" type="abbreviated">Exp. fluids</title><idno type="ISSN">0723-4864</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Experiments in fluids</title><title level="j" type="abbreviated">Exp. fluids</title><idno type="ISSN">0723-4864</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Boundary layers</term><term>Experimental study</term><term>Flow visualization</term><term>Laser induced fluorescence</term><term>Particle image velocimetry</term><term>Reynolds stress</term><term>Rough wall</term><term>Roughness</term><term>Test facilities</term><term>Turbulence structure</term><term>Turbulent flow</term><term>Velocity measurement</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Couche limite</term><term>Ecoulement turbulent</term><term>Structure turbulence</term><term>Paroi rugueuse</term><term>Rugosité</term><term>Etude expérimentale</term><term>Vélocimétrie image particule</term><term>Visualisation écoulement</term><term>Installation essai</term><term>Mesure vitesse</term><term>Fluorescence induite par laser</term><term>Contrainte Reynolds</term><term>4727N</term><term>4780</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Particle image velocimetry (PIV) measurements and planar laser induced fluorescence (PLIF) visualizations have been made in a turbulent boundary layer over a rough wall. The wall roughness consisted of square bars placed transversely to the flow at a pitch to height ratio of λ/k = 11 for the PLIF experiments and λ/κ = 8 and 16 for the PIV measurements. The ratio between the boundary layer thickness and the roughness height k/δ was about 20 for the PLIF and 38 for the PIV. Both the PLIF and PIV data showed that the near-wall region of the flow was populated by unstable quasi-coherent structures which could be associated to shear layers originating at the trailing edge of the roughness elements. The streamwise mean velocity profile presented a downward shift which varied marginally between the two cases of i/k, in agreement with previous measurements and DNS results. The data indicated that the Reynolds stresses normalized by the wall units are higher for the case λ/k = 16 than those for λ/k = 8 in the outer region of the flow, suggesting that the roughness density effects could be felt well beyond the near-wall region of the flow. As expected the roughness disturbed dramatically the sublayer which in turn altered the turbulence production mechanism. The turbulence production is maximum at a distance of about 0.5k above the roughness elements. When normalized by the wall units, the turbulence production is found to be smaller than that of a smooth wall. It is argued that the production of turbulence is correlated with the form drag.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Provence-Alpes-Côte d'Azur</li></region><settlement><li>Marseille</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Djenidi, Lyazid" sort="Djenidi, Lyazid" uniqKey="Djenidi L" first="Lyazid" last="Djenidi">Lyazid Djenidi</name></noRegion><name sortKey="Antonia, Robert A" sort="Antonia, Robert A" uniqKey="Antonia R" first="Robert A." last="Antonia">Robert A. Antonia</name></country><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Amielh, Muriel" sort="Amielh, Muriel" uniqKey="Amielh M" first="Muriel" last="Amielh">Muriel Amielh</name></region><name sortKey="Anselmet, Fabien" sort="Anselmet, Fabien" uniqKey="Anselmet F" first="Fabien" last="Anselmet">Fabien Anselmet</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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