Structure of turbulent boundary layers on smooth and rough walls
- 25 October 1994
- journal article
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 277, 1-21
- https://doi.org/10.1017/s0022112094002661
Abstract
The structure of turbulent boundary layers which develop with zero pressure gradient on a smooth wall and ak-type rough wall was examined using arrays of X-wires. Although the data were obtained only on two orthogonal planes, the technique provides some information on the three-dimensionality of the large-scale structures. The major effect of the roughness is to tilt the inclination of the structures towards the wall-normal direction. This is caused by the reduced damping of the wall-normal velocity fluctuations close to the rough surface and the break-up of structures whose scales are comparable to the size of the roughness elements. Both effects cause a reduction in the streamwise lengthscales, as suggested by all the measured two-point correlations. The correlations also show that the roughness tends to reduce the overall anisotropy of the large-scale motion. There is evidence to suggest that the magnitude of the vorticity field is larger over the rough wall.Keywords
This publication has 14 references indexed in Scilit:
- RMS spanwise vorticity measurements in a turbulent boundary layerExperiments in Fluids, 1993
- The use of orthogonal X-wire arrays for structure investigation in a turbulent boundary layerExperiments in Fluids, 1993
- Effect of Reynolds number on the topology of the organized motion in a turbulent boundary layerJournal of Fluid Mechanics, 1990
- Turbulent Boundary Layer Development over Rough SurfacesPublished by Springer Science and Business Media LLC ,1987
- Turbulent Flow Over Mesh RoughnessPublished by Springer Science and Business Media LLC ,1987
- The Structure of the Outer Intermittent Region of Turbulent Boundary Layers with Injection and Suction through a SlitBulletin of JSME, 1986
- The Structure of a Boundary Layer on a Rough Wall with Blowing and Heat TransferJournal of Heat Transfer, 1979
- Turbulent Boundary Layers on Wire-Screen RoughnessesBulletin of JSME, 1967
- Turbulent boundary layers in incompressible flowProgress in Aerospace Sciences, 1962
- On The Kinematics of TurbulenceJournal of the Aeronautical Sciences, 1948