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. .. Bluff-body-flow,

. .. The-von-kármán-vortex-shedding, 1.1.2 Instability studies for different cross-sections, p.9

. .. Reynolds-number,

, Attempts of a universal description

, Discussion on the vortex shedding around different geometries, p.13

. .. Noise, Theoretical foundations of aeroacoustics and cylinder

. .. , 20 1.2.3.3.1 Correction using indicators of the flow spanwise distribution, The effect of boundaries and integral solutions

, Compact tonal sectional model

A. .. , 23 1.3.1 Previous studies of the influence of the cross-section on cylinder noise

, Principal questions and current approach

, The shape influence on two-dimensional laminar flow noise 27

. .. Methodology,

. .. Numerical-setup, 30 2.2 Study of canonical geometries, vol.34

. .. Unsteadiness, 36 2.2.3.1 Methodology for obtaining the critical Reynolds number

. .. Empirical-relationships, 45 2.3.1 Methodology and discussion over model selection

. .. Relations, 55 2.3.3.1 Critical Reynolds number vs. aspect ratio

, Synthesis of the empirical laws and concluding remarks, p.64

. .. Further-parametric-studies, , p.68

, Inferences from the parametric studies

, 71 2.5.3 Context of this chapter, Discussion of the results and final remarks on cross-section influence on bluff body noise

. .. Optimization, 73 3.1.1 Principles of a shape optimization procedure

. .. , 1.2.3 Surrogate based shape optimization framework, p.76

, Discussion over the selected optimizer and optimization framework, p.77

. .. Pso), 78 3.2.3 Discussion about the optimization settings, Particle Swarm Optimization, p.81

. .. Social,

. .. Shape-optimizations, 3.1.2 Selection of the optimization factors

. .. Tetragon, 3.2.2.2 Fluctuating lift and acoustic power, p.99

. .. , 106 3.4.2 Flow and geometrical features associated with extreme noise production

, Lift eduction and artificial spectra

. .. , 2 Influence of aspect ratio for rectangular cylinders

, 6.3.1.1 Correction using empirical laws for the Reynolds number dependent quantities, vol.177

. .. Oaspl-data, 179 4.6.4.2.1 Vortex shedding frequency and Reynolds number thresholds

, Observed behavior for the square cylinder

, Conclusions regarding the length effect

. .. Study, 192 4.7.1 General remarks on the phenomenon

, Conclusion and perspectives 197

. .. , On the influence of the cross-section in studied 2D and 3D flows

. .. , An energetic view of shape influence on bluff body flow and noise

. .. , 3 Final comments and perspectives

, Une formule dérivée de l'équation de Curle pour un cylindre compact permet la quantification de l'émission acoustique en 2D. En soufflerie anéchoïque, la signature acoustique d'une trentaine de géométries est mesurée, p.0

, anémométrie par fil chaud est utilisée pour la description des propriétés axiales de l'écoulement

, Les géométries allongées sont généralement les plus silencieuses car les tourbillons sont moins intenses et repoussés vers l'aval et l'apparition de l'instationnarité est retardée. De leur côté, les résultats expérimentaux montrent que les géométries allongées sont les plus bruyantes, ce qui est à l'opposé des conclusions précédentes. Ceci est justifié par une augmentation significative de la cohérence de l'écoulement en envergure pour les AR les plus longs, presque complètement en phase, donc plus efficace acoustiquement. Globalement, cela implique que les géométries dont l'écoulement 2D est faiblement perturbé, marqué par un déclenchement plus tardif de l'instationnarité (Reynolds critique plus élevé), sont aussi plus organisées en 3D aux Re des mesures, L'avant corps et l'allongement (AR) sont les plus importantes propriétés géométriques tant pour l'écoulement que pour le rayonnement acoustique en 2D

, Mots clés : sifflement éolien, bruit de cylindre, aéroacoustique, écoulement d'obstacle, sillage de Von Karman