Title
Infuence Of Free-Stream Turbulence On Boundary Layers
Document Type
Report
Department
Mechanical Engineering
Report Number
ARC-12397
Funder
National Aeronautics and Space Administration (NASA)
Publication Date
6-1-1992
First Page
1
Last Page
55
Abstract
The influence of near isotropic free-stream turbulence on the shape factors and skin friction coefficients of turbulent boundary layers is presented for the cases of zero and mild adverse pressure gradients. With free- stream turbulence, improved fluid mixing occurs in boundary layers with adverse pressure gradients relative to the zero pressure gradient condition, with the same free-stream turbulence intensity and length scale. Stronger boundary layers with lower shape factors occur as a result of a lower ratio of the integral scale of turbulence to the boundary layer thickness, and to vortex stretching of the turbulent eddies in the free-stream, both of which act to improve the transmission of momentum from the free-stream to the boundary layers.
Recommended Citation
Hoffman, J. A.; Kassir, S. M.; and Larwood, Scott M., "Infuence Of Free-Stream Turbulence On Boundary Layers" (1992). All Faculty Reports - School of Engineering and Computer Science. 7.
https://scholarlycommons.pacific.edu/soecs-facreports/7
