Abstract
A simplified model to estimate the amplitude and frequency content of the noise radiated by constant and varying (tapered) diameter cylinders has been developed. Using the measured intensity level of Aeolian tones for several constant diameter cylinders, the incremental source strength along the cylinder has been determined as a function of Reynolds numbers. After choosing an element size consistent with the correlation length of the vortex shedding, tapered cylinders are modeled as a series of small, discrete cylinders each of constant diameter. The total sound produced by the tapered cylinder is then determined by summing the contribution of each segment over the cylinder length, properly accounting for geometry using the assumption that the sources add incoherently. The results predicted by this approach have been found to be quantitatively consistent with the data measured for tapered cylinders at several orientations. The model can also be readily extended to examine the effect of nonuniform flow on radiated noise.
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