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Multi-armed jets: A subset of the blooming jets
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This study focuses on excited circular jets obtained through axial and helical excitations superimposed on an inlet velocity profile. Various forcing frequency ratios (axial to helical) were analysed in the range of 1.6 ≤ fa
≤ 3.2, with occurrence of bifurcating, trifurcating, and blooming jets reported in the literature. Analytical investigations of a spatio-temporal behaviour of forcing show that, apart from the above mentioned jets observed for particular frequency ratios, different types of multi-armed jets are likely to occur. This was reflected by direct numerical simulation performed in the paper. The simulations showed the existence of very strong and noticeable splitting of the jet into a fivefold jet and weaker splitting into 12- and 13-armed jets.
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