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Dynamic behavior of an unsteady trubulent boundary layer
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Jayaramen, R. Parikh, P. G. Reynolds, W. C. Carr, L. W. |
| Copyright Year | 1981 |
| Description | Experiments on an unsteady turbulent boundary layer are reported in which the upstream portion of the flow is steady (in the mean) and in the downstream region, the boundary layer sees a linearly decreasing free stream velocity. This velocity gradient oscillates in time, at frequencies ranging from zero to approximately the bursting frequency. For the small amplitude, the mean velocity and mean turbulence intensity profiles are unaffected by the oscillations. The amplitude of the periodic velocity component, although as much as 70% greater than that in the free stream for very low frequencies, becomes equal to that in the free stream at higher frequencies. At high frequencies, both the boundary layer thickness and the Reynolds stress distribution across the boundary layer become frozen. The behavior at higher amplitude is quite similar. At sufficiently high frequencies, the boundary layer thickness remains frozen at the mean value over the oscillation cycle, even though flow reverses near the wall during a part of the cycle. |
| File Size | 711825 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810019854 |
| Archival Resource Key | ark:/13960/t4gn3197r |
| Language | English |
| Publisher Date | 1981-07-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Oscillating Flow Reynolds Stress Dynamic Characteristics Stress Distribution Turbulent Boundary Layer Flow Velocity Unsteady Flow Free Flow Boundary Layer Flow Pressure Gradients Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
