This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Turbulent Separated Flow Over Wavy Surfaces
Buckles, John Jeffrey
Department of Study
Degree Granting Institution
University of Illinois at Urbana-Champaign
An experimental investigation of separated flow over wavy surfaces is presented in which laser-Doppler velocimetry is demonstrated to be a useful technique for velocity and turbulence data acquisition. Time-averaged velocity, turbulent intensity, skewness, and flatness data are given.
Data were taken in a forty foot long stainless steel water tunnel which was rectangular in cross section. The channel cross section was twenty four by two inches, the two inch dimension being vertical. The Plexiglas test section was at the downstream end with a removable bottom which had the waves machined into its surface. Data were taken over waves having peak-to-peak amplitude to wavelength ratios of .200 and .125 at a Reynolds number of 12000.
The size, shape and extent of the separated flow region is determined for both waves. The physical meaning of the turbulence data is interpreted in terms of flow structure and a modification of the classical view of separated flow is supported by the data. The data also provide a means of testing theoretical models of separated flow.