Our goal in the this work is to develop a hybrid Eulerian-Lagrangian technique for simulating the breakup and atomization of liquid jets. The large scales associated with the primary breakup of the liquid jet are captured using an Eulerian surface capturing technique. The present formulation uses the particle level set method of Enright et al. [3] implemented on an adaptive Cartesian mesh. The small scales associated with secondary breakup are modeled using a stochastic sub-grid model by tracking the droplets in a Lagrangian framework [1]. The transition from primary (Eulerian) to secondary (Lagrangian) atomization is defined implicitly by the local grid resolution, taking place when the liquid interface can no longer be properly resolved on the grid. The sub-grid droplets thus formed may undergo further breakup according to the secondary breakup model. The formulation is developed and several preliminary cases of drop breakup are performed.
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