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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

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

Краткое описание

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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