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TUMBLING RATES IN TURBULENT AND RANDOM FLOWS

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We analyse the tumbling of small non-spherical particles in random flows with finite correlation length and time. The orientational dynamics can be systematically analysed in terms of a perturbation expansion in the Kubo number, a dimensionless measure of the correlation time of the flow. We compare our results to those of experimental and numerical studies of tumbling in turbulent flows.

Author(s):

Kristian Gustavsson    
Department of Physics, University of Gothenburg
Sweden

Jonas Einarsson    
Department of Physics, University of Gothenburg
Sweden

Bernhard Mehlig    
Department of Physics, University of Gothenburg
Sweden