Hostname: page-component-745bb68f8f-d8cs5 Total loading time: 0 Render date: 2025-01-09T21:50:47.648Z Has data issue: false hasContentIssue false
  • English
  • Français

Space–time results for a separating turbulent boundary layer using a rapidly scanning laser anemometer

Published online by Cambridge University Press:  20 April 2006

B. Chehroudi  and
R. L. Simpson
B. Chehroudi
Affiliation:
Department of Civil and Mechanical Engineering, Southern Methodist University, Dallas, Texas 75275 Present address: Mechanical and Aerospace Engineering Department, Princeton University, Princeton, NJ 08544.
R. L. Simpson
Affiliation:
Department of Civil and Mechanical Engineering, Southern Methodist University, Dallas, Texas 75275 Present address: The Department of Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061.
Get access Rights & Permissions [Opens in a new window]

Abstract

A rapidly scanning one-velocity-component directionally sensitive fringe-type laser-Doppler anemometer which scans the measurement volume perpendicular to the optical axis of the transmitting optics was used to investigate the flow structure of the steady freestream separated turbulent boundary layer of Simpson, Chew & Shivaprasad (1981a). Space–time correlations were obtained for the first time in a separated turbulent boundary layer and showed that the integral lengthscale Ly for the large eddies grows in size towards detachment, although the ratio of this lengthscale to the boundary-layer thickness remains constant. Results also indicate local dependence of the backflow on the middle and outer regions of the boundary layer at a given instant in time.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 160 , November 1985 , pp. 77 - 92
Copyright
© 1985 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

Bates, C. J. & Hughes, T. D. 1976 J. Phys. E: Sci. Instrum. 9, 955–958.Google Scholar
Chehroudi, B. 1983 Ph.D. dissertation, Dept Civ. Mech. Engng, Southern Methodist University, Dallas.
Chehroudi, B. & Simpson, R. L. 1984 J. Phys. E: Sci. Instrum. 17, 131–136.Google Scholar
Shiloh, K., Shivaprasad, B. G. & Simpson, R. L. 1981 J. Fluid Mech. 113, 75–90.
Simpson, R. L., Chew, Y.-T. & Shivaprasad, B. G. 1981a J. Fluid Mech. 113, 23–51.
Simpson, R. L., Chew, Y.-T. & Shivaprasad, B. G. 1981b J. Fluid Mech. 113, 53–73.
Wei, Q.-D. & Sato, H. 1984 J. Fluid Mech. 143, 153–172.