Discussion of “Turbulence Measurements with Acoustic Doppler Velocimeters” by Carlos M. García, Mariano I. Cantero, Yarko Niño, and Marcelo H. García

B. Douroudian (1) , David Hurther (2) , Ulrich Lemmin (1)

1 LHE - Laboratoire d'hydraulique environnementale
2 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]

The paper by Garcia et al. deals with the problem of correctly measuring turbulence parameters with acoustic Doppler velocimeters (ADV; trade names ADV for Sontek and NDV for Nortek). The authors focus on the effects of sampling frequency and Doppler noise on turbulence parameters. To avoid loss of turbulence information, they suggest that data should be sampled above a determined frequency. In addition, noise should be removed by estimating the noise contribution. Their approach is based on a model-derived procedure. First, it would have been of interest to compare the modeled spectra with those obtained from their measurements to validate their model and instrument assumptions for the flow cases discussed. Second, the deviation from the -5/3 slope in the measured spectra due to filtering and/or noise effects has not been highlighted.

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]; Instrumentations et Détecteurs [physics.ins-det]

B. Douroudian, David Hurther, Ulrich Lemmin. Discussion of “Turbulence Measurements with Acoustic Doppler Velocimeters” by Carlos M. García, Mariano I. Cantero, Yarko Niño, and Marcelo H. García. Journal of Hydraulic Engineering, 2007, 133 (11), pp.1062-1073. ⟨10.1061/(ASCE)0733-9429(2007)133:11(1286)⟩. ⟨hal-00265848⟩