The present investigation addresses the general problem of three-dimensional boundary layers, produced whenever a solid object rotates surrounded by a viscous fluid, or when an obstacle is obliquely displaced with respect to the outer fluid. This type of flow is encountered in a variety of configurations of practical interest: centrifugal pumps, fans, turbomachinery elements, swept aircraft wings, computer hard disks, oil well drilling devices... All of these flows are well known to display strong instabilities that rapidly lead to a turbulent re´gime. Despite intensive work and recent advances [1] however, no full understanding of the turbulent breakdown process has yet been achieved.

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