Article Dans Une Revue Experiments in Fluids Année : 2024

Fully determined three-dimensional velocity field in a divergence-free convection experiment with rigid boundary conditions

Résumé

Various velocity measurements techniques for 1 fluid dynamics experiments have been developed over 2 the last four decades. These include Particle Image Ve-3 locimetry (PIV) and Particle Tracking Velocimetry (PTV), 4 both of which rely on imaging the flow with passive 5 particles. While these techniques now allow for an ac-6 curate determination of velocity fields at high particle 7 densities, they still suffer from significant inaccuracies 8 when it comes to measurements near boundaries, due 9 to smaller particle concentrations and imaging difficul-10 ties in these regions. To improve such measurements, 11 we developed a correction technique for measured ve-12 locity fields. Using a PTV approach, we reconstructed 13 the 3D velocity field from an experimental setup de-14 signed to study Rayleigh-Bénard convection in a tank. 15 We corrected the obtained velocity field to ensure its 16 accurate, rigid boundary conditions corresponding to 17 the tank walls, while keeping the flow divergence-free. 18 We then assessed the quality of the corrected velocity 19 fields by comparing them with the outputs of 3D numer-20 ical simulations that reproduced the precise experimen-21 tal conditions. The experimentally obtained divergence-22 free velocity fields with exact boundary conditions com-23 pare well with the results of the numerical simulations, 24 which validates our approach. Using synthetic images, 25 we estimated that our corrected fields are in better 26 agreement with numerical simulations (Pearson coeffi-27 cient R = 0.96) than the raw measured fields (Pearson 28 coefficient R = 0.91). We find that at high Reynolds 29 numbers, our results can be described by scaling laws 30 that are consistent with previous results from the lit-31

Fichier principal
Vignette du fichier
manips_STB.pdf (5.38 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

insu-04734095 , version 1 (13-10-2024)

Licence

Identifiants

Citer

Arthur Walbecq, Henri Samuel, Angela Limare. Fully determined three-dimensional velocity field in a divergence-free convection experiment with rigid boundary conditions. Experiments in Fluids, 2024, 65 (5), pp.70. ⟨10.1007/s00348-024-03807-y⟩. ⟨insu-04734095⟩
58 Consultations
102 Téléchargements

Altmetric

Partager

  • More