A RANS-LES Study of Swirling and Non-Swirling Jets

Studying swirling turbulent jet flows is important for both application-driven reasons and increasing our fundamental understanding of turbulence. Although experimental and numerical studies of swirling jet flows provided some insights into the processes causing the mixing enhancement of momentum and scalars, a definite understanding is still not achieved. The paper describes the development of a combined RANS/LES method for the investigation of the structure of swirling turbulent jet flows. Comparisons with experimental data provide evidence for the suitability of this combined RANS/LES approach.