Abstract
Jets of non-Newtonian liquids are common in many technical applications from agriculture over food processing to medical applications. We use our in-house multiphase Computational Fluid Dynamics code Free Surface 3D (FS3D) to perform incompressible direct numerical simulations (DNS) of non-Newtonian liquid jets injected into air in the near nozzle region and single oscillating droplets. FS3D uses the Volume of Fluid (VOF) method for interface tracking in combination with piecewise linear interface calculation (PLIC) to reconstruct the liquid interface. DNS are uniquely suited to our investigations, as they let us simulate small-scale 3D phenomena like the deformation of a liquid surface or the breakup of ligaments into droplets, which coarser numerical methods are unable to simulate and experimental methods often have difficulties in capturing. Furthermore, they allow us to investigate information inside the liquids, such as the shear stress distribution.
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