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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July 2018
Research Article|
July 26 2018
A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes
J. Dominski
;
J. Dominski
a)
1
Princeton Plasma Physics Laboratory
, 100 Stellarator Road, Princeton, New Jersey 08543, USA
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S. Ku;
S. Ku
1
Princeton Plasma Physics Laboratory
, 100 Stellarator Road, Princeton, New Jersey 08543, USA
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C.-S. Chang
;
C.-S. Chang
1
Princeton Plasma Physics Laboratory
, 100 Stellarator Road, Princeton, New Jersey 08543, USA
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J. Choi;
J. Choi
2
Computer Science and Mathematics Division, Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
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E. Suchyta;
E. Suchyta
2
Computer Science and Mathematics Division, Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
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S. Parker;
S. Parker
3
Center for Integrated Plasma Studies, Department of Physics, University of Colorado at Boulder
, Boulder, Colorado 80309, USA
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S. Klasky;
S. Klasky
2
Computer Science and Mathematics Division, Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
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A. Bhattacharjee
A. Bhattacharjee
1
Princeton Plasma Physics Laboratory
, 100 Stellarator Road, Princeton, New Jersey 08543, USA
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J. Dominski
1,a)
S. Ku
1
C.-S. Chang
1
J. Choi
2
E. Suchyta
2
S. Parker
3
S. Klasky
2
A. Bhattacharjee
1
1
Princeton Plasma Physics Laboratory
, 100 Stellarator Road, Princeton, New Jersey 08543, USA
2
Computer Science and Mathematics Division, Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
3
Center for Integrated Plasma Studies, Department of Physics, University of Colorado at Boulder
, Boulder, Colorado 80309, USA
Phys. Plasmas 25, 072308 (2018)
Article history
Received:
June 15 2018
Accepted:
July 10 2018
Citation
J. Dominski, S. Ku, C.-S. Chang, J. Choi, E. Suchyta, S. Parker, S. Klasky, A. Bhattacharjee; A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes. Phys. Plasmas 1 July 2018; 25 (7): 072308. https://doi.org/10.1063/1.5044707
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