Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-05T08:34:49.911Z Has data issue: false hasContentIssue false
  • English
  • Français

Turbulent boundary-layer wall-pressure fluctuations on smooth and rough walls

Published online by Cambridge University Press:  29 March 2006

William K. Blake
William K. Blake
Affiliation:
Naval Ship Research and Development Center, Washington, D.C. 20007
Get access Rights & Permissions [Opens in a new window]

Abstract

Turbulent boundary-layer wall-pressure measurements were made with ‘pinhole’ microphones three times smaller (relative to a boundary-layer displacement thickness) than microphones used in earlier work. The improved high-frequency resolution permitted examination of the influence of high-frequency eddies on smooth-wall pressure statistics. It was found that the space-time decay rate is considerably higher than previously reported. Measurements of cross-spectral density made with 5 Hz bandwidth filters disclosed low phase speeds at low frequency and small separation. Measurements were repeated on rough walls and parallels were drawn from knowledge of a smooth-wall boundary-layer structure to propose a structure for a rough-wall boundary layer. The effect of independently varying roughness height and separation on the large and small-scale turbulence structure was deduced from the measurements. It was found that roughness separation affected the very large-scale structure, whereas the roughness height influenced the medium and very small-scale turbulence.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 44 , Issue 4 , 16 December 1970 , pp. 637 - 660
Copyright
© 1970 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bendat, J. S. & Piersol, A. G. 1966 Measurement and Analysis of Random Data. Wiley.
Bradshaw, P. 1967 J. Fluid Mech. 30, 24.
Bull, M. K. 1967 J. Fluid Mech. 28, 71.
Clauser, F. H. 1956 Adv. Appl. Mech. 4, 1.
Coles, D. 1956 J. Fluid Mech. 1, 19.
Corcos, G. M. 1963 J. Acoust. Soc. Am. 35, 19.
Hanson, C. E. 1969 Acoustics and Vibration Lab MIT Rep. no. 79611–1.
Harrison, H. 1958 2nd Symposium of Naval Hydrodynamics, 107.
Hinze, J. O. 1959 Turbulence. McGraw-Hill.
Klebanoff, P. S. 1955 NACA Rep. no. 1247.
Kline, S. J., Reynolds, W. C., Schraub, F. A. & Runstadler, P. W. 1967 J. Fluid Mech. 30, 74.
Levine, N. & Schwinger, J. 1948 Phys. Rev. 73, 38.
Perry, A. E. & Joubert, P. N. 1963 J. Fluid Mech. 17, 19.
Schlichting, H. 1956 Boundary Layer Theory. McGraw-Hill.
Schliemer, H. H. 1956 U.S. Navy Underwater Sound Laboratory Rep. no. 747.
Skudrzyk, E. J. & Haddle, G. P. 1960 J. Acoust. Soc. Am. 32, 1.
White, P. 1969 J. Acoust. Soc. Am. 45, 1118.
Willmarth, W. W. & Wooldridge, C. E. 1962 J. Fluid Mech. 14, 187.