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Abstract: According to flow visualizations performed in water tunnel and referring to a simple phenomenological model describing the nature of exchanges occurring within a two-dimensional mixing layer, a model was built up to specify the nature of flows ensuring the recirculating zone equilibrium over the upper surface of a delta wing at high angle of attack. Perturbing the flows equilibrium leads to delay the vortex breakdown. To cite this article: O. Rodriguez, J. Pruvost, C. R. Mecanique 333 (2005). [Copyright &y& Elsevier]

The structure of the vortex asymetry around a circular cone at high incidence and Reynolds numbers of order 104, is related to the existence of at least four vortices shed from the apex and exhibiting vortex breakdown points correlated with the sign of the lateral force. Control of the lateral force by injection points out three regimes, and not two as usually admitted, corresponding to inversions of the lateral force direction. To cite this article: O. Rodriguez, J. Pruvost, C. R. Mecanique 332 (2004). [Copyright &y& Elsevier]