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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v35.i2.30
pages 130-145

Visualization and Scaling of Coherent Eddies in Wall-Bounded Turbulent Flows at Relatively Low Reynolds Numbers

Susanta K. Das
Department of Chemical Engineering, McGill University, 3610 University Street, Montreal, Quebec H3A 2B2, Canada; and Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
Mamoru Tanahashi
Department of Mechanical and Aerospace Engineering Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
S. Shiokawa
Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
Toshio Miyauchi
Dept. Mechanical and Aerospace Eng., Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; Organization for the Strategic Coordination of Research and Intellectual Properties Meiji University 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa, Japan

ABSTRACT

Visualization of coherent eddies in fully developed turbulent channel flows based on the scaling with characteristic variables associated with wall-bounded turbulence is performed using the results of the direct numerical simulation (DNS). DNS databases obtained by solving three-dimensional Navier-Stokes equations with different Reynolds number, based on the wall friction velocity and channel half, are employed to perform the visualization. The main objective is to assess the suitability of the characteristic variables of turbulence for direct visualization of coherent eddies in the instantaneous flow fields. Normalization variables used for turbulent statistics are examined to judge the best scaling variables of coherent eddy. The results show that the coherent eddies in fully developed turbulent channel flows is best visualized when scaled with Kolmogorov scale. The streamwise and the hairpins (loop-like) can be visualized simultaneously. The simulation results may provide an important insight to uncover behaviors of coherent eddies in turbulent flow fields.


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