First coupled GENE–XGC microturbulence simulations

Merlo, G.; Janhunen, S.; Jenko, F.; Bhattacharjee, A.; Chang, C. S.; Cheng, J.; Davis, P.; Dominski, J.; Germaschewski, K.; Hager, R.; Klasky, S.; Parker, S.; Suchyta, E.

doi:10.1063/5.0026661

First coupled GENE–XGC microturbulence simulations

Journal Article · Thu Dec 31 23:00:00 EST 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0026661· OSTI ID:1818685

^[1]; ^[1]; Jenko, F. ^[2]; Bhattacharjee, A. ^[3]; ^[3]; ^[4]; Davis, P. ^[5]; ^[3]; ^[6]; ^[3]; Klasky, S. ^[7]; Parker, S. ^[4]; ^[7]

Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, USA
Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, USA; Max Planck Institute for Plasma Physics, D-85748 Garching, Germany
Princeton Plasma Physics Laboratory, Princeton, New Jersey 08536, USA
Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
Rutgers Discovery Informatics Institute, Rutgers University, New Brunswick, New Jersey 08854, USA
Space Science Center and Department of Physics, University of New Hampshire, Durham, New Hampshire 03824, USA
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA

Covering the core and the edge region of a tokamak, respectively, the two gyrokinetic turbulence codes Gyrokinetic Electromagnetic Numerical Experiment (GENE) and X-point Gyrokinetic Code (XGC) have been successfully coupled by exchanging three-dimensional charge density data needed to solve the gyrokinetic Poisson equation over the entire spatial domain. Certain challenges for the coupling procedure arise from the fact that the two codes employ completely different numerical methods. This includes, in particular, the necessity to introduce mapping procedures for the transfer of data between the unstructured triangular mesh of XGC and the logically rectangular grid (in a combination of real and Fourier space) used by GENE. Constraints on the coupling scheme are also imposed by the use of different time integrators. First, coupled simulations are presented. We have considered collisionless ion temperature gradient turbulence, in both circular and fully shaped plasmas. Coupled simulations successfully reproduce both GENE and XGC reference results, confirming the validity of the code coupling approach toward a whole device model. Here, many lessons learned in the present context, in particular, the need for a coupling procedure as flexible as possible, should be valuable to our and other efforts to couple different kinds of codes in pursuit of a more comprehensive description of complex real-world systems and will drive our further developments of a whole device model for fusion plasmas.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1818685

Alternate ID(s):: OSTI ID: 1818870

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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