Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2002, Volume9

Issue 2&3

174 pages

Issue price - $280.00

P. Reulet
ONERA DMAE/ATAC, 2 Av. E. Belin 31055 Toulouse Cedex 04, France

M. J. Esteve
ONERA DMAE/ATAC, 2 Av. E. Belin 31055 Toulouse Cedex 04, France

P. Millan
ONERA DMAE/ATAC, 2 Av. E. Belin 31055 Toulouse Cedex 04, France

M. L. Riethmuller
von Karman Institute for Fluid Dynamics, 72 Chaussee de Waterloo, B-1640 Rhode Saint Genese, Belgique

A rectangular cavity with a length-to-depth ratio of 10 is characterized by means of two optical velocimetry systems: Laser Doppler Velocimetry (LDV) and Particles Images Velocimetry (PIV). Each of these two measurement systems provides a complementary contribution to the understanding of this complex flow. A detailed mean velocity field is acquired by LDV, it shows the presence of a thin fluid layer near the bottom wall where the flow goes upstream all along the cavity which is qualified to be "transitional" and includes a stagnation point within the flow. PIV measurements enable the detection of coherent structures in the flow and the analysis of their evolution near the stagnation point where they interact with the bottom wall. Three different zones are specially studied by a spectral analysis of the LDV velocity signals to define the main detachment frequency of coherent structures.

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