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Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Sep;86(3 Pt 2):036306. Epub 2012 Sep 10.

Effects of forcing geometry on two-dimensional weak turbulence.

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Department of Mechanical Engineering & Materials Science, Yale University, New Haven, Connecticut 06520, USA.


Using high-resolution particle tracking velocimetry, we study the effects of the forcing geometry on the statistics of an electromagnetically stirred thin-layer flow. We consider two forcing arrangements: one that produces a lattice of vortices as a base flow, and one that produces an array of shear bands. We find that the vortex flow drives stronger fluctuating kinetic energy while the shear-band flow leads to more intense fluctuating velocity gradients. We explain our results by considering the spectral flow of energy in the system. Our results have implications for the design of two-dimensional flow experiments.

[Indexed for MEDLINE]

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