Abstract
ABSTRACTΛ-vortex plays a pivotal role in the boundary layer transition process. In this paper, the generation of Lambda rotational core (Λ-vortex) in boundary layer transition and the role of TS (Tollmien–Schlichting) waves performed are studied by direct numerical simulation (DNS) in detail. It shows that the growth of TS wave under non-linear NS equations differs from the one under linearised NS (Navier–Stokes) equations at very early stage. With the evolution of TS waves, a newly found evolution procedure under non-linear NS equations helps to form the perturbation structures and lead them to evolve to Λ-vortices. The transition process undergoing the non-linear stage is also found to be much earlier than the previous studies had suggested.
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