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Self-sustained instability, transition, and turbulence induced by a long separation bubble in the footprint of an internal solitary wave. I. Flow topology

Using a high-accuracy-and-resolution implicit Large Eddy Simulation we study the development of the bottom boundary layer (BBL) driven by the long separation bubble which forms under an internal solitary wave (ISW) of depression propagating against a barotropic background current. We obtain insights on the structure of the initial instability in the form of a global mode with a distinct transverse structure, and that of the self-sustained transition and resulting fully developed turbulence along the bed. Comparisons are made to similar flow features previously found in shorter separation bubbles typical of applications in aerodynamics.