Implementation of particle-in-cell method on unstructured grids for numerical modeling of plasma devices

Methods and algorithms in the basis of computer program that implements axisymmetric electrostatic variant of particle-in-cell method on unstructured triangular grids are presented. Within the framework of the considered approach the Poisson equation is approximated using finite volume method. For the solution of the discritized Poisson equation multigrid method is used. Trajectories of the particles are computed using non-relativistic Boris method. Methods of interpolation of electric field on unstructured grids and determination of space charge in the computational area are discussed. Special attention is paid to the features of the applied methods specific to axisymmetric geometry. Developed computer program is tested using the problem of plane diode operated in the space charge regime.