%0 Journal Article
%A Murzyn, Frederic
%A Mehel, Amine
%D 2016
%I Begell House
%N 1
%P 62-78
%R 10.1615/InterJFluidMechRes.v43.i1.60
%T Influence of the Virtual Origin on the Turbulent Length Scales in the Grid-Generated Turbulence
%U http://dl.begellhouse.com/journals/71cb29ca5b40f8f8,6905f91f33f5392a,22d9021b77d4aafb.html
%V 43
%X 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 *x*_{0} on the turbulent macro (*L*_{f}), micro (*λ*_{f}) and Kolmogorov (*η*_{K}) length scales. Five possible virtual origins (0 < *x*_{0}/M < 8) are arbitrary chosen based on a literature review. Whatever *x*_{0}/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.
%8 2016-02-26