Interfaces, like liquid/gas or liquid/solid phase interfaces, play a dominant role in many technical applications and natural phenomena. A prime example for this is the atomization of liquids both in technical applications like engine injectors and natural phenomena like wave breaking. In collaboration with Arizona State University, Cascade Technologies has developed a procedure to simulate in detail the atomization process in its entirety. It consists of a multi-scale coupling between a tracked phase interface description, suitable for the primary atomization region, and a Lagrangian description, suitable for the secondary atomization region. The resulting simulation strategy tracks the details of the phase interface dynamics during primary atomization in the near injector region and transfers small scale, nearly spherical, separated liquid structures into a standard Lagrangian spray description.