Helical vortex rings in the wake of a disk

(2026) 6, pp. 1-14. (pdf)

Thad S. Morton

Abstract:
The structure of the wake behind a circular disk is examined in numerical solutions for Re = 50, 100, and 120. A slowly reversing helical (swirling) streamline structure was found to exist in the steady numerical solutions at these flow speeds, which are generally regarded as steady and axisymmetric. The nested stream surfaces resemble Reeb-like foliations. The loss in fore-aft symmetry of the pressure field due to the viscous term may be associated with the azimuthal drift seen in the streamlines.

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