We present three-dimensional Particle-in-Cell simulations of an unmagnetized body immersed in the solar wind. The simulations are performed using the implicit electromagnetic Particle-in-Cell code iPIC3D [Markidis, 2009]. Multiscale kinetic physics is resolved for all plasma components (heavy ions, protons and electrons) in the code, recently updated with a set of open boundary conditions designed for solar wind - body interaction studies. Particles are injected at the inflow side of the computational domain and absorbed at all others. In particular, iPIC3D is applied to: 1) a spacecraft charging study and 2) a detailed investigation of wake physics behind a Moon-sized body.
