A computational methodology to account for the liquid film thickness evolution in Direct Numerical Simulation of prefilming airblast atomization

Prefilming airblast atomization is widely used in aero engines. Fundamental studies on the annular configuration of atomizers are difficult to realize. For this reason, researchers focused planar configurations. In regard, Karlsruhe Institute Technology (KIT) developed a test rig conduct experimental activities, conforming large database with results for different conditions. Such data allow validation two-phase flow calculations concerning primary these devices. The present investigation proposes Direct Numerical Simulation (DNS) KIT through Volume Fluid (VOF) method within PARIS code. novelty compared DNS reported literature resides use boundary condition that accounts not only gas inflow turbulence but also spatio-temporal evolution liquid film thickness at inlet and its effect turbulence. proposed methodology requires computing precursor single-phase Large-Eddy Simulations. Results account constant (both timewise spanwise) domain inlet, validating workflow. improves qualitative description breakup mechanism, as stages (liquid accumulation behind prefilmer edge, bag formation, breakup, ligament formation breakup) coexist spanwise given temporal snapshot. This implies more continuous than one predicted by case, which showed same stage be along span instant led discretized set events. workflow allows quantifying influence above frequency features.