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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 47, 2020 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.v43.i1.60
pages 62-78

Influence of the Virtual Origin on the Turbulent Length Scales in the Grid-Generated Turbulence

Frederic Murzyn
ESTACA West Campus, Laval, 78066, France
Amine Mehel
ESTACA'Lab, Department of Mechanical Engineering, Campus Paris Saclay, 12 avenue Paul Delouvrier, CS20749, 78066 Saint Quentin en Yvelines, France

Краткое описание

The turbulent flow downstream of a single square grid is being experimentally investigated in a relatively small-sized wind tunnel. 2D LDV (Laser Doppler Velocimetry) measurements are conducted at the centerline of the channel for Reynolds numbers ranging from 8300 to 24870. Two grids are tested with two mesh sizes (M) and the solidity coefficient is always kept constant. We aim at discussing the influence of the position of virtual origin x0 on the turbulent macro (Lf), micro (λf) and Kolmogorov (ηK) length scales. Five possible virtual origins (0 < x0/M < 8) are arbitrary chosen based on a literature review. Whatever x0/M is, we demonstrate that macro, micro and Kolmogorov length scales can be predicted by empirical laws according to some confidence intervals of 30, 20 and 15 % respectively. Comparisons with others experimental data are also provided to validate the model. Best choice for the virtual origin is also provided for the present set of experiments.