Abstract
The wall pressure fluctuations in a turbulent channel flow have been calculated from a numerical solution of the full Navier Stokes equation. No closure or subgrid scale approximations have been made. The wavenumber-frequency spectra of the pressure fluctuations obtained in this work show the following characteristics of particular note: (a) a “convective ridge” associated with those components of the pressure fields propagating in the streamwise direction and at a significant fraction of the free streamvelocity; (b) comparable dimensions of the wall pressure structure in the streamwise and spanwise directions; (c) a nonzero value of the pressure spectrum at zero wavenumber. This last result is shown theoretically to be a consequence of the boundary conditions associated with a channel flow.
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