Application of a wavelet cross-correlation analysis to DNS velocity signals

摘要

A wavelet cross-correlation analysis is applied to the velocity signals derived from axisymmetric direct numerical simulations of a coaxial jet configuration. It is shown that this technique allows determination of the time intervals and scales contributing to the Reynolds stresses, and thus an assessment of the level of intermittency of this contribution at the various scales. The availability of the vorticity field from the numerical simulations makes possible association of the roll-up, passage and pairing of vortical structures with average spectral and instantaneous contributions to the Reynolds stresses.