Energy dissipation scaling in uniformly sheared and in multi- structure turbulence

Abstract eng:
First, we investigated the streamwise evolution of the dissipation parameter Cε in uniformly sheared flow (USF). We observed three distinct regions in which Cε ∝ Reα λ , with respective values of the exponent α equal to −0.6, 0.5 and 0, the latter one termed as “fully developed USF”, where Cε is constant. Second, we introduced a uniform grid within a developed USF and created a “multi–structure” turbulent flow, which had a region with α = −1 and then eventually relaxed to fully developed USF again.

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