A two dimensional (2-D) combined edge plasma/Navier-Stokes neutral transport model is used in a computational study of dissipative divertor plasmas in the collisional limit for neutrals, with ITER-like plasma conditions and scale lengths. The neutral model contains three momentum equations that are coupled to the plasma through ionization, recombination and ion-neutral elastic collisions. The neutral transport coefficients are evaluated including both ion-neutral and neutral-neutral collisions. The structure of fully detached plasma solutions is studied for ITER plasma conditions. These detached solutions are obtained through a combination of impurity radiation, from a simplified impurity model, and neutral flow baffling. Solution sensitivities are elucidated to: (a) baffle location, (b) upstream plasma density and Lyman-α opacity, (c) volume recombination and (d) neutral-neutral collisions.
The role of neutral gas in validated global edge turbulence simulations