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: This report presents the technical contributions of different physical models for studying the flow induced vibrations of Olmsted wickets. Experimental results of two Froude scale models (1:25 and 1:5 scales) for different flow configurations are compared to examine the effectiveness of the physical similitude models. It also indicates that the sensitivity of the size effects decreases as the model size increases. This experiment demonstrates that the global design parameters could be roughly simulated with a small scale model (1:25) without going through elaborate reproduction of an exact replica of its prototype. Sensitivity of the sensors and the reproduction of mechanical joints in a small scale model are the primary factors governing the effectiveness of a very small scale model. Experimental results of a hybrid rigid body model of the wicket suggest that the higher order frequency contributions on the predicted response are negligible. The knowledge gained from the models and prototype studies complemented each other by providing information unique to each of the systems. For the flow configurations examined in this investigation, a Froude model adequately reproduces the structural as well as hydraulic phenomena of the Olmsted wicket.

Flow-Induced Structural Response of a 1:5-Scale Olmsted Wicket Model