DNS of Boundary Layer Transition Induced by a Coherent Perturbation
EINDHOVEN UNIV OF TECH (NETHELANDS) DEP OF MECHANICAL ENGINEERING
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Bypass transition of a boundary layer takes place at high main stream turbulence levels. It is governed by the intrusion of non-linear disturbances into the viscous sublayer. In this paper a numerical study is presented in which a spatially developing laminar boundary layer is subdued to large scale non- linear disturbances. The fully compressible Navier-Stokes equations are solved using direct numerical simulation with a higher order finite difference method on a collocated grid. The results show that the initially smooth disturbance rapidly changes into an arrow-head structure with the characteristics of a turbulent spot.
- Fluid Mechanics