Abstract
Two specific gust forms were simulated using Computational Fluid Dynamics. Simultaneously a flat-plate model was manipulated in a water-tunnel facility to generate equivalent effective incidence and velocity variations at the leading edge. By comparing the two results, the potential of simulating a gust with equivalent model motions was thus undertaken. A first-order analysis using classical unsteady theory predicted that a gust was equivalent to a moving model experiencing the same velocities so long as the reduced frequency was low. However, direct force measurements were found to contradict this result from classical analysis showing large deviations in the total measured forces. Further measurements using Particle Image Velocimetry revealed that leading-edge vortex (LEV) growth on a moving model was equivalent to LEV growth from a gust for an equivalent effective leading-edge incidence and velocity. Despite this similarity in the LEV growth, both the added mass effects of an accelerating model, as well as the convective speed of the gust, were found to contribute large discrepancies between the gust simulation techniques.
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