Detection of Lagrangian coherent structures in the supersonic turbulent boundary layer

摘要

Vortex organization and coherent structure statistics are of greatrnimportance in the study of supersonic turbulent boundary layers, as well as shockwave/rnboundary-layer interactions. In this contribution, direct numerical simulationrn(DNS) is used to reveal the coherent structures in the turbulent boundary layer atrnMach 2.7 and Reynolds number Re_θ=4300 . The Lagrangian coherent structuresrnin the flow, based on the finite time Lyapunov exponent, are extracted, and thernconditional statistic are presented.