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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v16.i3.40
pages 255-277

RELIABILITY OF 5-BEAM LDV FIBEROPTIC PROBE FOR TURBULENCE MEASUREMENTS IN THE WALL REGION OF OPEN-CHANNEL FLOW

Giancarlo Alfonsi
Fluid Dynamics Laboratory, Universita della Calabria, Via P. Bucci 42b, 87036 Rende (Cosenza), Italy
Samuele de Bartolo
Dipartimento di Difesa del Suolo, Università della Calabria, Via P. Bucci 42b, 87036 Rende (Cosenza)
Roberto Gaudio
Dipartimento di Difesa del Suolo, Università della Calabria, Via P. Bucci 42b, 87036 Rende (Cosenza)
Leonardo Primavera
Fluid Dynamics Laboratory, Universita della Calabria, Via P. Bucci, Cubo 42b, 87036 Rende (Cosenza), Italy

SINOPSIS

A 5-beam LDV fiberoptic probe is used for an experimental investigation of turbulent open (water) channel flow at ReτH = 601 (the Reynolds number based on friction velocity and hydraulic radius). The performances of the instrument are mainly investigated in the region near the bottom wall of the open channel, with regard to both mean and fluctuating velocity components, and the results are compared with the data of numerical nature related to DNS calculations, as performed in the case of the plane channel (the flow between two parallel plates) at a very close value of the Reynolds number. Due to the different flow conditions along the vertical direction in the experimental open channel and in the numerical plane channel, near-wall comparisons are considered only for the streamwise- and spanwise-velocity components.


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