Dr. Moody raises two issues related to the prediction of flow-excited acoustic resonances; namely, the scaling approach of resonance prediction and the influence of flow, including vortex formation and convection in the shear layer, on the resonance frequency and mode shape. These are indeed important issues and warrant additional comment and clarification. We first elaborate on the usage of the proposed source terms, such as those shown in Figs. 21 and 24, in predicting acoustic resonances for piping systems of different sizes, geometries, and flow conditions, and then discuss the main difficulties involved in amplitude scaling when small-scale model tests are performed to assess the liability of a full-size installation to flow-excited acoustic resonances. This will be followed by a discussion of the effect of the pipe flow on the acoustic resonance frequencies and mode shapes.

The scaling of pressure amplitudes measured within the resonance...

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