TY  - JOUR
AU  - Horsten, N.
AU  - Groth, M.
AU  - Blommaert, M.
AU  - Dekeyser, W.
AU  - Pérez, I. Paradela
AU  - Wiesen, S.
TI  - Application of spatially hybrid fluid–kinetic neutral model on JET L-mode plasmas
JO  - Nuclear materials and energy
VL  - 27
SN  - 2352-1791
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2021-05621
SP  - 100969 -
PY  - 2021
AB  - We present a spatially hybrid fluid–kinetic neutral model that consists of a fluid model for the hydrogen atoms in the plasma grid region coupled to a kinetic model for atoms sampled at the plasma–void interfaces and a fully kinetic model for the hydrogen molecules. The atoms resulting from molecular dissociation are either treated kinetically (approach 1) or are incorporated in the fluid model (approach 2). For a low-density JET L-mode case, the hybrid method reduces the maximum fluid–kinetic discrepancies for the divertor strike-point electron densities and electron temperatures from approximately 150% to approximately 20% for approach 1 and to approximately 40% for approach 2. Although the simulations with purely fluid neutral model become more accurate for increasing upstream plasma density, we still observe a significant improvement by using the hybrid approach. When consuming the same CPU time in averaging the electron strike-point densities and temperatures over multiple iterations as for the simulations with fully kinetic neutrals, hybrid approach 1 reduces the statistical error with on average a factor 2.5. Hybrid approach 2 further increases this factor to approximately 3.3, at the expense of accuracy.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000657474100002
DO  - DOI:10.1016/j.nme.2021.100969
UR  - https://juser.fz-juelich.de/record/904051
ER  -