The resulting RMS surface pressure fluctuation distributions reflect the importance of the high frequency wall region contributions. Scaling parameters for the p spectra beneath three-dimensional flows must incorporate local flow structure in order to be successful. Analysis based on the Poisson equation shows that variation of the high frequency spectral levels are related to the variation in near-wall mean velocity gradients and v 2 structure. Measurements of the correlation coefficient between surface pressure and velocity fluctuations show that there can be sources of p away from the wall in three-dimensional flows. Sources of p away from the wall are significant in terms of fluid-structure interaction since they contribute low frequency fluctuations.
Structures typically have low resonant frequencies.
Sources of p away from the wall are also significant in terms of radiated sound since they are likely to interact with the free-stream and be radiated away as sound. The following files contain power spectra of surface pressure fluctuations. Just download the files to your IBM-compatible computer and run the programs to extract the data files and their descriptions. Get Acrobat Reader . Each data file contains the spectral power density of surface pressure fluctuations in both dimensional and non-dimensional form.