Coupled uniform momentum zones and internal layers in turbulent wall flows

Abstract eng:
A candidate flow configuration is identified that has the potential to generate a self-sustaining interaction between a single vortical fissure and adjacent uniform momentum zones, i.e. the primal coherent structures and interactions observed in the outer part of turbulent wall flows at asymptotically large Reynolds number Re. Matched asymptotic analysis is used to derive a reduced set of PDEs governing the coupled dynamics of the fissure and uniform momentum zones in the limit Re → ∞. The analysis clarifies the nature of the hypothesized interaction and provides an equation set that is suitable for efficient multiscale numerical simulations.

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