ASA 126th Meeting Denver 1993 October 4-8

5aNS8. Computation of turbulent boundary layer wall pressure spectra.

Dean Capone

Naval Surface Warfare Ctr., Acoust. Res. Detachment, Code 752, Bayview, ID 83803

Gerald C. Lauchle

Penn State Univ., State College, PA 16804

The suitability of various wave-vector--frequency spectral models for predicting the point wall pressure spectrum due to developed turbulent boundary-layer flow over planar, rigid surfaces is investigated. The incompressible and compressible models developed previously [D. Chase, J. Sound Vib. 112, 125--147 (1987)] are given particular attention. The effect of finite-sized measurement transducers is included in the integration of the theoretical wave-vector--frequency spectrum over the in-plane wave numbers in order to arrive at an attenuated point pressure frequency spectrum that can be compared directly to existing experimental data [G. Schewe, J. Fluid Mech. 134, 311--328 (1983) (air), G. C. Lauchle and M. A. Daniels, Phys. Fluids 30, 3019--3024 (1987) (glycerine), and M. P. Horne and R. A. Handler, Exp. Fluids 12, 136--139 (1991) (water)]. The selected experiments cover a wide range of fluid properties and Reynolds numbers: it is found that the optimum set of empirical constants needed to exercise the Chase models depends on the experiment considered. The need to consider viscous effects in future modeling is borne out when dealing with viscous fluids like glycerine. [Work supported by various U.S. Navy projects at NSWC and ARL Penn State.]