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Scale-dependent response of fluid turbulence under variation of the large-scale forcing

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Di Lorenzo,  F.
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Di Lorenzo, F. (2015). Scale-dependent response of fluid turbulence under variation of the large-scale forcing. PhD Thesis, Georg-August-Universität, Göttingen.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-22E7-7
Abstract
In this work, an experiment to measure the temporal evolution of energy transfer at different scales in a turbulent flow that was subject to a perturbation of the energy injection is described. Two types of experiments were performed. In the first type a step-function-like increase of the energy input was used to force the turbulent flow. In the second case the forcing of a fully developed turbulent flow was switched off to observe the decay of the turbulence. Experiments investigating the scale dependent response of a turbulent flow to a perturbation of the large-scale forcing have, to the best knowledge of the author, not been done so far. This is due to the complexity of the endeavor and the limitations of state-of-the-art measurement techniques. The approach to overcome these limitations and the hardware developed for this purpose is also documented in this thesis.