Scale-dependent Response of Fluid Turbulence under Variation of the Large-scale Forcing
von Fabio Di Lorenzo
Datum der mündl. Prüfung:2015-02-03
Erschienen:2016-02-03
Betreuer:Prof. Dr. Eberhard Bodenschatz
Gutachter:Prof. Dr. Eberhard Bodenschatz
Gutachter:Prof. Dr. Jörg Enderlein
Dateien
Name:20160202_Di Lorenzo PHD Thesis_fwv.pdf
Size:7.83Mb
Format:PDF
Description:Fabio Di Lorenzo, PhD Thesis
Zusammenfassung
Englisch
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.
Keywords: Turbulence, Scale-dependent response, Lagrangian Particle Tracking, real-time image compression, FPGA