Abstract
Three-dimensional, fully unsteady Navier-Stokes simulations are carried out in order to study the mechanisms governing vortex breakdown in swirling jets. For sufficiently large swirl numbers, the initial breakdown is followed by the formation of an axisymmetric, quasisteady velocity field. In the wake region of the primary breakdown bubble, a finite region of absolute instability is observed to exist that gives rise to the formation of a temporally periodic, helical instability, thereby resulting in the familiar’ spiral vortex breakdown structure.’ This finding hence suggests that the transition from axisymmetric to helical breakdown is a manifestation of a global mode instability.
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Chen, P., Meiburg, E. (2000). Direct Navier-Stokes simulations of unsteady vortex breakdown in a swirling jet. In: Gyr, A., Koumoutsakos, P.D., Burr, U. (eds) Science and Art Symposium 2000. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4177-2_17
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DOI: https://doi.org/10.1007/978-94-011-4177-2_17
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