A direct numerical simulation (DNS) of coaxial jets with a strong swirl has been carried out and the mixingcharacteristics have been investigated with the help of two separate passive scalars injected from the jets. Acase of coaxial jets without swirl is also considered for the comparison purpose. The strongly swirling casedevelops an internal recirculation zone (IRZ), which results into the enhanced radial outward flux of inner jetscalar concentration as well as the faster rate of inward spread of outer jet scalar concentration. This resultsinto an early mixing of jets in swirling case as compared to that in non-swirling case.
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