[Seminar] The periodic Kolmogorov flow: a virtual channel flow
Prof. Stefano Musacchio, University of Turin
The periodic Kolmogorov flow: a virtual channel flow
The Kolmogorov flow provides an ideal instance of a virtual channel flow: It has no boundaries, but it possesses a well defined mean flow. In this talk, I will show how this remarkable feature can be exploited for the purpose of investigating the interplay between the mean flow and the turbulent drag of the bulk flow. I will review the results of numerical simulations at increasing Reynolds number, which show the dependence of the bulk turbulent drag on the amplitude of the mean flow. I will present a detailed analysis of the scale-by-scale energy balance, which describes how kinetic energy is redistributed among different regions of the flow while being transported toward small dissipative scales. I will discuss how these results are affected by the presence of particles and polymers suspended in the fluid.
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