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Physical Review Letters – 28 November 2003
Volume 91, Issue 22

The images are cross sections of fluid flow in a pipe, showing traveling waves with two-fold up to five-fold symmetry. All four states have fast downstream motion close to the wall (red) and slow fluid flow near the center (dark blue); in-plane motion is shown by arrows. These numerical solutions are all unstable but may have relevance to the problem of turbulent flow in pipes. [Holger Faisst and Bruno Eckhardt, Phys. Rev. Lett. 91, 224502 (2003)]

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