The theory and modelling group of IPPLM is performing research activities which are focused on numerical simulations of plasmas. The group has developed a number of numerical codes (eg. TECXY, COREDIV) which have been widely used to study plasma and impurity dynamics in tokamaks. The 2D edge fluid code TECXY includes drift effects in fully self-consistent way, whereas the physical model implemented in the COREDIV code is able to describe self-consistently coupling between core and edge plasma. Results of numerical studies of plasma and impurity transport in ELMy H-mode Ne seeded JET shots  will be presented and code predictions for strongly radiating DEMO reactor operation scenarios will be discussed.

The group contributed also to the development of finite-difference 3D edge code (FINDIF) capable to simulate plasma transport in stellarators. The basic ideas of the numerical approach will be reviewed and first results for W7-X stellarator will be presented.