Institution: | a Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, People's Republic of China b Department of Mechanical Engineering, University of Newcastle, NSW 2308, Australia |
Abstract: | Using two orthogonal arrays of 16 X-wires, eight in the (x,y)-plane and eight in the (x,z)-plane, the effect of the Reynolds number in a turbulent plane far-wake has been investigated for two values of Reθ (based on the free stream velocity and the momentum thickness), i.e. 1350 and 4600. It is observed that as the Reynolds number increases the magnitudes of the measured Reynolds stresses increase, as does the size of two-point vorticity correlation iso-contours. Discernible differences are also observed in probability density function, spectra and three-dimensional topologies. The Reynolds number dependence seems to vanish when Reθ5000. |