We perform Large-eddy simulations (LES) of an annular swirling turbulent jet. The swirl parameter is considered within the range S = 0.3-0.6. The Reynolds number based on the bulk velocity and outer pipe diameter is 8900 while the outer to inner diameter ratio is 2. We obtain different flow regimes without and with the vortex breakdown occurring for S = 0.4. Coherent vortical structures for each regime are indentified using the azimuthal Fourier decomposition and the Proper orthogonal decomposition (POD). The turbulent kinetic energy accumulates in the first POD modes with the azimuthal number m = 1.
|Number of pages||6|
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 21 Nov 2019|
|Event||4th All-Russian Scientific Conference Thermophysics and Physical Hydrodynamics with the School for Young Scientists, TPH 2019 - Yalta, Crimea, Ukraine|
Duration: 15 Sep 2019 → 22 Sep 2019
- PRECESSING VORTEX CORE
- COHERENT STRUCTURES