Abstract
Direct numerical simulation of time-developing mixing layers has been performed. The structure of the mixing layer is visualized by means of the vorticity contour and passive scalar. Numerical results were compared with the smoke patterns. Mixing layer was generated behind a splitter plate towed in a straight long tunnel. Acoustic forcing was applied to excite the shear layer and also to induce wave resonance in the free shear layer. We found that scalar distributions is similar to smoke pattern in the vortical structure in prior to pairing. This paper describes the structure recognition by visualization technique.
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