Abstract
The spatial and temporal behaviors of counter-rotating vortex filaments in ground effect have been investigated experimentally in a water tunnel over a range of thirteen span lengths. The vortices have been generated using two flat blades and the ground has been modeled with a splitter plate. Streamwise ridges of varying height and spacing have been added to the ground plane and their effects on vortex trajectories and vortex meandering have been studied. Three sets of data are presented that include different vortex strengths and vortex spans, in addition to variations in the ground roughness. In comparison with the results for a smooth ground plane, vortex trajectories, their preferred direction of motion, and the rate of growth of their amplitudes of motion have been shown to be insensitive to terrain roughness.
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