A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes

Dominski, Julien; Ku, Seung-Hoe; Chang, C. -S.; Choi, Jong Youl; Suchyta, Eric D.; Parker, S.; Klasky, Scott A.; Bhattacharjee, Amitava

doi:10.1063/1.5044707

Title: A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes

Journal Article · Thu Jul 26 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5044707· OSTI ID:1463317

^[1]; Ku, Seung-Hoe ^[1];

^[1];

^[2];

^[2]; Parker, S. ^[3];

^[2]; Bhattacharjee, Amitava ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division
Univ. of Colorado, Boulder, CO (United States). Center for Integrated Plasma Studies, Dept. of Physics

A new scheme that tightly couples kinetic turbulence codes across a spatial interface is introduced. This scheme evolves from considerations of competing strategies and down-selection. It is found that the use of a composite kinetic distribution function and fields with global boundary conditions as if the coupled code were one makes the coupling problem tractable. In contrast, coupling the two solutions from each code across the overlap region is found to be more difficult due to numerical dephasing of the turbulent solutions between two solvers. Another advantage of the new scheme is that the data movement can be limited to the 3D fluid quantities, instead of higher dimensional kinetic information, which is computationally more efficient for large scale simulations on leadership class computers.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC02-09CH11466; AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1463317

Alternate ID(s):: OSTI ID: 1468017

Journal Information:: Physics of Plasmas, Vol. 25, Issue 7; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Exascale applications: skin in the game Alexander, Francis; Almgren, Ann; Bell, John Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 378, Issue 2166 https://doi.org/10.1098/rsta.2019.0056	journal	January 2020