Abstract
Cylinder wake velocity measurements were made at Reynolds number 100 with varying levels of free-stream turbulence. The Grassberger–Procaccia (G–P) correlation function, which is often used for estimating fractal dimension, was computed for these data, and also for data obtained by adding random noise to the iterations of the Henon map. A comparison of the two plots shows that the free-stream turbulence acts as a highly random external noise source. Since free-stream turbulence determines the details of the smaller flow scales, no low-order dynamical system will be able to model all the scales in this open flow.
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