Abstract
This paper examines the effect of grid resolution on the solution of a B2-EIRENE simulation of a partially detached ITER divertor plasma. Due to the large amount of required computational time in coupled finite-volume/Monte-Carlo codes, simulations of the plasma edge are typically run on coarse grids. However, new averaging techniques make simulations with finer grids feasible. Starting from the original numerical grid, simulations are performed on two successively finer grids. Results of the numerical error analysis reveal that the discretization errors are large. Peak values are particularly sensitive to grid resolution and can increase more than for the same model input parameters. However, this effect is partially offset by a modification of the operational space of the ITER divertor in this case. By choosing the numerical parameters more adequately, a total numerical error of only has been achieved within a feasible computational time.
| Original language | English |
|---|---|
| Article number | 026001 |
| Journal | Nuclear Fusion |
| Volume | 59 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2019 |
| Externally published | Yes |
Funding
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work is sponsored by Flanders Innovation and Entrepreneurship (IWT.141064).
Keywords
- B2-EIRENE
- Monte Carlo
- convergence
- numerical errors
- plasma edge
- simulation strategy
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