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Particle-in-Cell (PIC) methods are widely used computational tools for fluidand kinetic plasma modeling. While both the fluid and kinetic PIC approacheshave been successfully used to target either kinetic or fluid simulations,little was done to combine fluid and kinetic particles under the same PICframework. This work addresses this issue by proposing a new PIC method,PolyPIC, that uses polymorphic computational particles. In this numericalscheme, particles can be either kinetic or fluid, and fluid particles canbecome kinetic when necessary, e.g. particles undergoing a strong acceleration.We design and implement the PolyPIC method, and test it against the Landaudamping of Langmuir and ion acoustic waves, two stream instability and sheathformation. We unify the fluid and kinetic PIC methods under one commonframework comprising both fluid and kinetic particles, providing a tool foradaptive fluid-kinetic coupling in plasma simulations.

PolyPIC: the Polymorphic-Particle-in-Cell Method for Fluid-Kinetic Coupling