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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. 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]
+ Show Author Affiliations
  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 Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
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)
OSTI Identifier:
1463317
Alternate Identifier(s):
OSTI ID: 1468017
Grant/Contract Number:  
AC02-09CH11466; AC02-05CH11231; AC05-00OR22725
Resource Type:
Journal Article: 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.
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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. https://doi.org/10.1063/1.5044707
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Dominski, Julien, Ku, Seung-Hoe, Chang, C. -S., Choi, Jong Youl, Suchyta, Eric D., Parker, S., Klasky, Scott A., and Bhattacharjee, Amitava. 2018. "A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes". United States. https://doi.org/10.1063/1.5044707. https://www.osti.gov/servlets/purl/1463317.
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@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. 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},
url = {https://www.osti.gov/biblio/1463317}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 25,
place = {United States},
year = {Thu Jul 26 00:00:00 EDT 2018},
month = {Thu Jul 26 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5044707
Copyright Statement
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Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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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Works referenced in this record:

A new hybrid-Lagrangian numerical scheme for gyrokinetic simulation of tokamak edge plasma
journal, June 2016

A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1
journal, May 2018

Hello ADIOS: the challenges and lessons of developing leadership class I/O frameworks: HELLO ADIOS
journal, August 2013

Gyroaveraging operations using adaptive matrix operators
journal, May 2018

The global version of the gyrokinetic turbulence code GENE
journal, August 2011

Compressed ion temperature gradient turbulence in diverted tokamak edge
journal, May 2009

Foundations of nonlinear gyrokinetic theory
journal, April 2007

Gyroaveraging operations using adaptive matrix operators
text, January 2018

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    Works referencing / citing this record:

    Exascale applications: skin in the game
    journal, January 2020

    • 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
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      Figures / Tables found in this record:

      FIG. 1(p. 4)figure
      FIG. 2(p. 5)figure
      FIG. 3(p. 5)figure
      FIG. 4(p. 6)figure
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