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

Abstract

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. Finally, 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.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [2];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division
  3. Univ. of Colorado, Boulder, CO (United States). Center for Integrated Plasma Studies, Dept. of Physics
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1463317
Alternate Identifier(s):
OSTI ID: 1468017
Grant/Contract Number:  
AC02-09CH11466; AC02-05CH11231; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Dominski, Julien, Ku, Seung-Hoe, Chang, C. -S., Choi, Jong Youl, Suchyta, Eric D., Parker, S., Klasky, Scott A., and Bhattacharjee, Amitava. A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes. United States: N. p., 2018. Web. doi:10.1063/1.5044707.
Dominski, Julien, Ku, Seung-Hoe, Chang, C. -S., Choi, Jong Youl, Suchyta, Eric D., Parker, S., Klasky, Scott A., & Bhattacharjee, Amitava. A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes. United States. doi:10.1063/1.5044707.
Dominski, Julien, Ku, Seung-Hoe, Chang, C. -S., Choi, Jong Youl, Suchyta, Eric D., Parker, S., Klasky, Scott A., and Bhattacharjee, Amitava. Thu . "A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes". United States. doi:10.1063/1.5044707. https://www.osti.gov/servlets/purl/1463317.
@article{osti_1463317,
title = {A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes},
author = {Dominski, Julien and Ku, Seung-Hoe and Chang, C. -S. and Choi, Jong Youl and Suchyta, Eric D. and Parker, S. and Klasky, Scott A. and Bhattacharjee, Amitava},
abstractNote = {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. Finally, 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.},
doi = {10.1063/1.5044707},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 1 work
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Figures / Tables:

FIG. 1 FIG. 1: Illustration of the radial domains of coupled simulation. The core, the overlap and the edge regions are shown. The connection function ϖ is described in the three regions: in the core ϖ = 1, in the overlap region 0 < ϖ < 1, and in edge ϖ =more » 0. The core simulation domain is going beyond the overlap up to $ψ$ = 0.95 (red dashed line). This region of the core simulation where ϖ = 0 is a buffer region where core simulation’s markers (red circles) do not contribute to Poisson equation but are nonetheless evolved with their weight according to the gyrokinetic equation. A similar buffer region exists in the edge simulation.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.