Poster: DNS on spray formation
Résumé
We depict and analyse the successive steps of atomisation via vortex dynamics for a turbulent liquid jet by using Direct Numerical Simulations. The top panels show the spatio-temporal representation of the interfacial dynamics coloured by the streamwise vorticity. Magnified views of the interface with the three-dimensional coherent vortical structures visualised by the Q-criterion are shown in the bottom panels. At early stages of the atomisation, a periodic array of Kelvin-Helmholtz rings are formed. Then, the vortex rings are deformed in the streamwise direction due to a mutual-induction resulting in a `knitting' between two consecutive vortex rings. A careful study of the distribution of vortexsigns show the assembling into counter-rotating vortex pairs.
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