Abstract
Large-eddy and direct numerical simulations of complex, three-dimensional turbulent jets are performed to investigate the origin of streamwise vorticity and axis-switching mechanism. The filtered Navier-Stokes equations are solved at high Reynolds numbers along with a sub-grid scale model to approximate effects of unresolved scales. A low-storage, third-order Runge Kutta scheme is used for temporal discretization and a fourth-order compact scheme is used for spatial discretization. Axis switching is observed in simulations of rectangular and elliptic jets. Analysis of the source terms of the mean streamwise vorticity equation through post-processing of the instantaneous results shows that a complex interaction of gradients of the normal and shear Reynolds stresses is responsible for the generation of streamwise vorticity which leads to axis switching in the turbulent rectangular and elliptic jet simulations.
| Original language | English |
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| State | Published - 1998 |
| Externally published | Yes |
| Event | Proceedings of the 1998 ASME Fluids Engineering Division Summer Meeting - Washington, DC, USA Duration: Jun 21 1998 → Jun 25 1998 |
Conference
| Conference | Proceedings of the 1998 ASME Fluids Engineering Division Summer Meeting |
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| City | Washington, DC, USA |
| Period | 06/21/98 → 06/25/98 |