Abstract
The near fields of turbulent round free jets with swirl numbers of S=0.0 and 0.24 are modeled with large eddy simulations that use a dynamic Smagorinsky subgrid scale model. The time-averaged results are in accordance with other numerical and experimental data. Instantaneous plots of vorticity are used to examine the evolution of and interaction between coherent structures. Ring structures aligned with the plane normal to the flow form downstream of the jet shear layer and collide with the streamwise braid structures. The resulting interaction cause the rings to break apart into smaller, less organized turbulence structures. The addition of swirl increases the number of streamwise braids, which enhances the breakdown mechanism of the rings. The results suggest that the increased entrainment observed in swirling flows is due to the action of the braids rather than the rings.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
