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We present a technique to perform interface-resolved simulations of complexbreakup dynamics in two-phase flows using the Cahn-Hilliard Navier-Stokesequations. The method dynamically decreases the interface thickness parameterin relevant regions and simultaneously increases local mesh resolution,preventing numerical artifacts. We perform a detailed numerical simulation ofpulsed jet atomization that shows a complex cascade of break-up mechanismsinvolving sheet rupture and filament formation. To understand the effect ofrefinement on the breakup, we analyze the droplet size distribution. Theproposed approach opens up resolved simulations for various multiphase flowphenomena.

Breakup dynamics in primary jet atomization using mesh- and interface- refined Cahn-Hilliard Navier-Stokes