Advanced spatially hybrid fluid‐kinetic modelling of plasma‐edge neutrals and application to <scp>ITER</scp> case using <scp>SOLPS‐ITER</scp>

Uytven, Wim Van; Dekeyser, Wouter; Blommaert, Maarten; Horsten, N.; Marandet, Y.; Baelmans, Martine

doi:10.1002/ctpp.202100191

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…These hybrid methods aim to combine the benefits of kinetic and fluid neutral models, guaranteeing an accurate solution for any combination of target material and geometry, while providing speed-up and noise reduction compared to fully kinetic neutral models. Development of such models is ongoing, such as condensation-evaporation models [28,32], micro-macro models [33] and spatially hybrid models [17,27]. A comprehensive overview of the working principles and current status of the different hybrid approaches can be found in reference [34].…”

Section: Tungsten Targetsmentioning

confidence: 99%

Assessment of advanced fluid neutral models for the neutral atoms in the plasma edge and application in ITER geometry

et al. 2022

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The neutral atoms in the plasma edge of nuclear fusion devices are typically modeled using either a fluid or kinetic approach. The kinetic approach is most accurate, but it has two main disadvantages. First, the usual solution of the high-dimensional kinetic equation using Monte Carlo techniques introduces statistical noise, which hampers the convergence of the coupled plasma-neutral model. Second, the computational time strongly increases for highly collisional regimes. For these reasons, deterministic fluid neutral models remain an attractive alternative, in particular for the highly collisional conditions where their accuracy is expected to be high. In recent years, efforts have been undertaken to improve the agreement between the fluid and kinetic approach by introducing consistent transport coefficients and consistent boundary conditions in the fluid models. In this work, these so-called advanced fluid neutral models are further enhanced by introducing different strategies to cope with the high heterogeneity of the ion-neutral collisionality encountered in realistic plasma-edge geometries, namely isotropic neutral flux limiters and an automated selection criterion for the optimal neutral boundary conditions. The validity of the resulting fluid neutral models is thoroughly assessed for various representative simulation cases with different geometries, divertor collisionalities, and wall materials, including, for the first time, simulations in a realistic ITER plasma edge geometry. Strong quantitative agreement between the fluid and kinetic models is achieved for cases with highest divertor collisionality.

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Section: Tungsten Targetsmentioning

confidence: 99%

Assessment of advanced fluid neutral models for the neutral atoms in the plasma edge and application in ITER geometry

et al. 2022

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Discretization error estimation for EU‐DEMO plasma‐edge simulations using SOLPS‐ITER with fluid neutrals

Van Uytven,

Dekeyser,

Subba

et al. 2024

Contrib. Plasma Phys

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A grid refinement study is performed for mean‐field plasma boundary simulations with fluid neutrals in an EU‐DEMO geometry. In general, grid convergence of the simulations is achieved, with differences between the finest and second‐finest grid of <5% for the majority of the quantities of interest. The estimated discretization errors for the original 96 × 36 grid are mostly in the 4%–25% range. However, it is also shown that exceptions are possible due to the non‐linear nature of plasma boundary codes. Hence, it is advised to regularly perform grid refinement studies on subsets of cases.

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Validation of SOLPS-ITER simulations with kinetic, fluid, and hybrid neutral models for JET-ILW low-confinement mode plasmas

Horsten¹,

Groth²,

Dekeyser³

et al. 2022

Nuclear Materials and Energy

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Advanced spatially hybrid fluid‐kinetic modelling of plasma‐edge neutrals and application to ITER case using SOLPS‐ITER

Cited by 4 publications

References 14 publications

Assessment of advanced fluid neutral models for the neutral atoms in the plasma edge and application in ITER geometry

Assessment of advanced fluid neutral models for the neutral atoms in the plasma edge and application in ITER geometry

Discretization error estimation for EU‐DEMO plasma‐edge simulations using SOLPS‐ITER with fluid neutrals

Validation of SOLPS-ITER simulations with kinetic, fluid, and hybrid neutral models for JET-ILW low-confinement mode plasmas

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