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The interaction between a laminar boundary layer and an open cavity isinvestigated experimentally for Reynolds numbers between 860 and 32300. Flowvisualizations are carried out for different observation directions in order tounderstand the spatial development of dynamical structures. The study isconducted by changing the cavity length and height and the external flowvelocity, and therefore the flow patterns inside the cavity. The issue is toemphasize the three-dimensional development of the flow. In particular, we showthat the cavity dynamical structures are not due to secondary shear layerinstabilities. G\"ortler-type vortices are developing inside the cavity forsome parameters and their properties are discussed. The existence diagram ofthese instabilities is also provided.

Apparition de structures tourbillonnaires de type G\"ortler dans une cavit\'e parall\'el\'epip\'edique ouverte de forme variable