Abstract
We present a statistical and topological study of the spatial growth of a round jet up to twelve diameters downstream from the nozzle. The use of large-eddy simulations allow us to reach high Reynolds number values: here, Re = 25000. It is shown that, at a reasonable computational cost, good comparisons with experimental data can be achieved. We successively consider the case of the “natural” unexcited jet and the case of the jet excited with specified inflow perturbations at the nozzle. The natural jet alternatively exhibits axisymmetric (rings) and helicoidal vortex structures. Further downstream, we observe that the alternate inclination of the rings yields localized alternated pairings. We have showed that this structure can be forced to appear from the nozzle with an adhoc excitation leading to the preferential development of the jet in one particular direction. When axisymmetric excitation is applied, after vortex rings have formed, pairs of counter-rotating longitudinal vortices appear linked with primary rings and these create horizontal side jets. Longitudinal vortices are still present when a helicoidal excitation is imposed.
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Urbin, G., Métais, O. (1997). Large-Eddy Simulations of Three-Dimensional Spatially-Developing Round Jets. In: Chollet, JP., Voke, P.R., Kleiser, L. (eds) Direct and Large-Eddy Simulation II. ERCOFTAC Series, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5624-0_4
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DOI: https://doi.org/10.1007/978-94-011-5624-0_4
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