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Angular Velocity of Kolmogorov-Scale Fibers as Proxy for Turbulent Dissipation
Domenico Zaza1,2, Vlad Giurgiu1, Michele Iovieno3
1TU Wien, Institute of Fluid Mechanics and Heat Transfer, 1060 Vienna, Austria.
Abstract:
We introduce a fiber-based method to directly measure turbulent energy dissipation. Combining original measurements of the full-body rotation-tumbling and spinning-of short, Kolmogorov-scale fibers in turbulent channel flow with direct numerical simulations using a point-fiber model, we show that the mean-square angular velocity closely reproduces the mean dissipation rate. The method is accurate both in the nearly homogeneous turbulence of the channel center and in the logarithmic layer, with a mean deviation below 6%, demonstrating that Kolmogorov-scale fibers provide a robust and reliable tool for quantifying dissipation.
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