Spatial hot-wire visualization of the Lambda-structure transformation into the turbulent spot on the smooth flat plate surface and riblet effect on this process
Journal article, 2010

Evolution of the Lambda-vortex and its transformation into the turbulent spot in a flat plate boundary layer are investigated experimentally. Extensive measurements visualizing the Lambda-structure transformation into the turbulent spot on the smooth and ribbed surfaces of the flat plate are presented. The flow behavior in the course of spatial evolution of the Lambda-structure and turbulent spot is discussed. Specific features of the downstream evolution of Lambda-structure and turbulent spot on the smooth and ribbed surfaces are demonstrated, such as suppression by riblets of the Lambda-vortex transformation into the turbulent spot, appearance of the coherent structures of Lambda-vortex within ensemble-averaged turbulent spot, and oblique waves generation both by the Lambda-vortex and turbulent spot.

Visualization

Turbulent spot

Lambda-structure

Riblets

Hot-wire anemometry

Author

Valery Chernoray

Chalmers, Applied Mechanics, Fluid Dynamics

G. R. Grek

Russian Academy of Sciences

V. V. Kozlov

Russian Academy of Sciences

Y. A. Litvinenko

Russian Academy of Sciences

Journal of Visualization

1343-8875 (ISSN) 1386-6478 (eISSN)

Vol. 13 2 151-158

Subject Categories

Physical Sciences

Fluid Mechanics and Acoustics

DOI

10.1007/s12650-009-0004-7

More information

Latest update

8/13/2021