Abstract
We study the instability of a concave boundary layer (Görtler instability) on a concave-convex model, in a water channel. Two different geometries were used either with (no streamwise pressure gradient) or without a counter-profile (favorable streamwise pressure gradient). In the first case Görtler vortices were present and randomly spaced. In the second case no vortex was detectable. The two flows exhibite different responses to localized forcings. We argue that these results may be interpreted by the non-linear convective instability concept, with a subcritical bifurcation when in presence of a favorable pressure gradient (accelerating flow).
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Chomaz, J.M., Perrier, M. (1991). Nature of the Görtler Instability: A Forced Experiment. In: Jiménez, J. (eds) The Global Geometry of Turbulence. NATO ASI Series, vol 268. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3750-2_3
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DOI: https://doi.org/10.1007/978-1-4615-3750-2_3
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