Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Validation of edge turbulence codes against the TCV-X21 diverted L-mode reference case
 
research article

Validation of edge turbulence codes against the TCV-X21 diverted L-mode reference case

Oliveira, D. S.
•
Body, T.
•
Galassi, D.
Show more
September 1, 2022
Nuclear Fusion

Self-consistent full-size turbulent-transport simulations of the divertor and scrape-off-layer (SOL) of existing tokamaks have recently become feasible. This enables the direct comparison of turbulence simulations against experimental measurements. In this work, we perform a series of diverted ohmic L-mode discharges on the tokamak a configuration variable (TCV) tokamak, building a first-of-a-kind dataset for the validation of edge turbulence models. This dataset, referred to as TCV-X21, contains measurements from five diagnostic systems from the outboard midplane (OMP) to the divertor targets-giving a total of 45 one- and two-dimensional comparison observables in two toroidal magnetic field directions. The experimental dataset is used to validate three flux-driven 3D fluid-turbulence models-GBS, GRILLIX and TOKAM3X. With each model, we perform simulations of the TCV-X21 scenario, individually tuning the particle and power source rates to achieve a reasonable match of the upstream separatrix value of density and electron temperature. We find that the simulations match the experimental profiles for most observables at the OMP-both in terms of profile shape and absolute magnitude-while a comparatively poorer agreement is found towards the divertor targets. The match between simulation and experiment is seen to be sensitive to the value of the resistivity, the heat conductivities, the power injection rate and the choice of sheath boundary conditions. Additionally, despite targeting a sheath-limited regime, the discrepancy between simulations and experiment also suggests that the neutral dynamics should be included. The results of this validation show that turbulence models are able to perform simulations of existing devices and achieve reasonable agreement with experimental measurements. Where disagreement is found, the validation helps to identify how the models can be improved. By publicly releasing the experimental dataset and validation analysis, this work should help to guide and accelerate the development of predictive turbulence simulations of the edge and SOL.

  • Files
  • Details
  • Metrics
Type
research article
DOI
10.1088/1741-4326/ac4cde
Web of Science ID

WOS:000827830800001

Author(s)
Oliveira, D. S.
Body, T.
Galassi, D.
Theiler, C.  
Laribi, E.
Tamain, P.
Stegmeir, A.
Giacomin, M.
Zholobenko, W.
Ricci, P.  
Show more
Date Issued

2022-09-01

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

62

Issue

9

Article Number

096001

Subjects

Physics, Fluids & Plasmas

•

Physics

•

divertor

•

simulation

•

turbulence

•

validation

•

plasma turbulence

•

transport

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
August 1, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/189709
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés