Abstract
The Gortler instability is investigated experimentally in a water channel of high curvature. Two different kinds of experiments are presented. The first one corresponds to an experiment where the flow rate increases and where we study the instability in a given longitudinal position along the concave wall. We find a law for the full nonlinear behavior as a correlation for the velocity perturbation as a function of the Gortler number. In the second set of experiments, we follow the spatial evolution of the instability along the concave wall for a given flow rate. We observe the saturation due to the nonlinearities and to the diminution of the thickness of the boundary layer. We show the importance of the initial conditions and of the wavelength in the evolution of the instability.
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