DOI: 10.1615/TSFP2
EFFECT OF INITIAL CONDITIONS ON TURBULENT STRUCTURES OF VARIOUS SCALES IN A WAKE
RESUMO
The turbulent structures of various scales behind the solid and porous wake-generating bodies with the same characteristic dimension have been studies by the wavelet vector multi-resolution technique. Making a comparison of instantaneous sectional streamlines of various scales obtained with each wake generator, it is found that the behavior of large- and intermediate-scale structures in wakes depends on the initial conditions and the small-scale structures is independent of the initial conditions. The most significant contribution to Reynolds stress and turbulent energy appears to come from the large-scale and rib-like structures in the cylinder wake. In the screen wake, however, only the large-scale structure exhibits more contribution.