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- W2314911798 abstract "The dynamic near-field characteristics of an isothermal turbulent swirling jet in a generic swirl burner is numerically studied and validated. The results are compared to experimentally obtained PIV data. Large Eddy Simulations are employed and their respective sensitivity is assessed regarding the grid resolution and the subgrid-scale modeling. The flow dynamics are investigated for varying swirl intensities. It was found that the low-swirling case was considered in an intermediate state in the critical region of the onset of vortex breakdown. The high-swirling case revealed a dominant frequency in the turbulent energy spectra, which could be identified as a convective helical instability by applying a modal analysis. This helical instability is assumed to be triggered by a precessing vortex core (PVC). Additionally, it was found that the azimuthal momentum transfer is increased by the PVC, leading to a better mixing. Furthermore, it is shown that the dynamics of a swirling flow can be excellently captured by using LES." @default.
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- W2314911798 date "2013-06-22" @default.
- W2314911798 modified "2023-10-01" @default.
- W2314911798 title "Numerical Investigations and Modal Analysis of the Coherent Structures in a Generic Swirl Burner" @default.
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- W2314911798 doi "https://doi.org/10.2514/6.2013-2953" @default.
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