Analytical Investigation of Co-Rotating Vortex Filaments with Experimental Verification

Miller, Teresa S.; Kliment, Linda K.; Rokhsaz, Kamran

doi:10.2514/6.2003-3601

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…While the period, frequencies and amplitudes of small oscillations cannot be evaluated with non-temporally resolved data, the total magnitudes of displacements and the location distribution of the meandering can be determined with non temporally resolved data and a sufficiently large sample size. Such methodology has been used by Miller et al [33] and Rokhsaz [34] at 30 Hz, as well as Heyes et al [35] at 5 Hz. The core variance was calculated as the standard deviation of the radial distance from the average core location, while the circulation variance was calculated from the standard deviation of the difference from instantaneous circulation to average circulation, divided by the average circulation on the plane.…”

Section: Vortex Meanderingmentioning

confidence: 99%

Interactions of a counter-rotating vortex pair at multiple offsets

Forster

Barber

Diasinos

et al. 2017

Experimental Thermal and Fluid Science

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The interactions between two streamwise vortices were investigated by wind tunnel testing of two NACA0012 vanes at various lateral offsets. One vane was spaced 10 chord lengths (C) downstream of the other, with both at an angle of incidence of 8 degrees and a Reynolds number of 7 10 4. The evolution of the vortex pair was observed until 6.5C behind the downstream vane using Particle Image Velocimetry (PIV). It was found that proximity of the upstream vortex to the downstream vane had a significant effect on the rotational rate of the subsequent vortex pair, with far offset cases having little rotation, and near field cases having angle changes of 19.6 degrees per chord length travelled downstream. At the point of vortex impingement on the downstream vane, the rotational rate dropped to near zero due to a significant strength reduction of both vortices. The point of strongest interaction was found to be laterally offset from the point of closest vortex proximity to the downstream vane by 0.15C, with the vortex on the suction side of the vane. In the offset range investigated, a significant instability was observed in only the upstream vortex. These instabilities increased as the proximity between the vortices decreased, peaking where the vortex interaction was strongest.

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Section: Vortex Meanderingmentioning

confidence: 99%