Concurrent scale interactions in a turbulent shear flow

Abstract eng:
The interaction between concurrent large-scale velocity fluctuations and small-scale velocity and velocity-gradient fluctuations is examined with both experimental and complementary DNS data. It is shown that both the sign and the magnitude of the large-scale velocity fluctuation affect this scale interaction, as does the definition of the “modulating” large scales, with a distinct peak interaction length-scale identified. The results are explained via a “convective” mechanism whereby high activity small-scale fluctuations are transported from the centre-line of the shear flow by the large-scale velocity fluctuations.

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