On pressure fluctuations under turbulent boundary layers
Over the last few years, there has been considerable interest in the fluctuating pressure field on the wall beneath a turbulent boundary layer or in pipe flow, and several investigators have measured important properties of the pressure field such as its r.m.s. value, frequency spectrum or apparent convection velocity (cf. Harrison 1958, Hodgson 1962, Bakewell et al. 1962, Willmarth and Wooldridge 1962). The interest in the wall pressure fluctuations arises mainly because of their operation as a forcing function on the wall, giving rise to surface deflections which may be important in themselves, perhaps causing acoustic fatigue or transmitting noise, or may react on the flow itself, causing changes in the turbulence structure.
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