Effect of riblets on nonlinear disturbances in the boundary layer
Journal article, 2006

Results of experimental investigations of the nonlinear stage of sinusoidal and varicose instability of a streaky structure, which leads to multiplication of streaky structures and origination of coherent structures (such as Λ-structures), are presented. Riblets suppress the intensity of streaky structures, stabilize the flow against the development of the secondary high-frequency instability of streaky structures, and, for this reason, delay spatial turbulization of the flow. The results of these investigations can be useful for understanding the flow structure in such situations and for possible controlling of the coherent structures aimed at flow stabilization

Author

Valery Chernoray

Chalmers, Applied Mechanics

V.V. Kozlov

Lennart Löfdahl

Chalmers, Applied Mechanics

G.R. Grek

H.H. Chun

Thermophysics and Aeromechanics

Vol. 13 1 67-74

Subject Categories

Fluid Mechanics and Acoustics