We will perform high-fidelity simulations of the electrostatic spray transfer process in high-speed rotary bell sprayers using a 3D Eulerian-Lagrangian framework. The simulations will be carried out in OpenFOAM, incorporating complex multiphysics phenomena including spray atomization, compressible airflow, particle tracking, and electrostatic interactions. Accurate turbulence modeling will be crucial to compute the compressible flow field, and different modeling options will be explored. This setup allows us to analyze the interaction between airflow and droplet motion in detail, and provide insights into flow features such as the recirculation zone, toroidal vortex formation and overspray.