Summary: In order to model rarefied plasma flows under conditions where continuum assumptions fail, a cooperation between IRS (Institute of Space Systems, University of Stuttgart), IAG (Institute for Aerodynamics and Gas Dynamics, University of Stuttgart), HLRS (High Performance Computing Center Stuttgart) and IHM (Institute for Pulsed Power and Microwave Technology, Research Center Karlsruhe) has been formed. Within the project “Modeling and Simulation on High Performance Computers", which is funded by the Landesstiftung Baden-Württemberg, a scheme for solving the Boltzmann equation for rarefied, non-continuum plasma flows is under development, making use of well known approaches from PIC (Particle in Cell) and DSMC (Direct Simulation Monte Carlo). The modeling will be explained in some detail and required computational resources will be estimated.