Abstract
The temporal instability and nonlinear evolution of the swirling jet near a nozzle exit are studied by both normal-mode method and three dimensional direct numerical simulation (3D DNS). It is found that the swirl enhances the maximum linear growth rates for negative helical modes, while decreases the growth rate for axisymmetric mode. Numerical simulations show that the evolution in early sage is compared well with the linear stability theory. In nonlinear stage, the swirl promotes the breakup of 3D large scale organized structures in the flow into small eddies.
Original language | English (US) |
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Pages (from-to) | 237-244 |
Number of pages | 8 |
Journal | Acta Mechanica Sinica/Lixue Xuebao |
Volume | 17 |
Issue number | 3 |
State | Published - Aug 2001 |
Keywords
- Finite difference
- Instability
- Swirling jet
ASJC Scopus subject areas
- Computational Mechanics
- Mechanical Engineering