Interventional Causality Analysis of Fully Developed Turbulent Channel Flow
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The causal events in fully developed open channel flow at Reτ = 609 are studied using direct numerical simulations. Spatially localized perturbations are imposed on the flow, and the causal significance of perturbed flow structures is measured by the perturbation growth. The results show that for wall-attached perturbations, the causal event is local high shear, while for wall-detached perturbations, it is intense sweep.