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In this article, a thorough characterization of the configuration composed bytwo concentric jets at a low Reynolds number is presented. The analysiscomprises a layout with a wide range for the velocity ratio between the innerand outer jets, defined within the interval [0, 2], and also details theinfluence of the distance between jets, where the wall thicknesses separatingthe two jets is [0.5, 4]. Global linear stability analysis identifies the mostsignificant modes driving the changes in the flow dynamics. The neutral linesrevealing the critical Reynolds number connected to the presence of the main(steady and unsteady) flow bifurcations, which are presented by globalazimuthal modes, show the high complexity of the problem under study, wherehysteresis and other types of complex cycles are pointed out. Finally, the modeinteraction is analysed, highlighting the presence of travelling waves emergingfrom the interaction of steady states, and the existence of robust heterocliniccycles that are asymptotically stable. The high level of detail in the resultspresented, makes this work as a reference for future research development inthe field of concentric jets.

Mode selection in concentric jets. The steady-steady 1:2 resonant mode interaction with O(2) symmetry