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

J. Dominski, S. Ku, C. S. Chang, J. Choi, E. Suchyta, S. Parker, S. Klasky, A. Bhattacharjee

Research output: Contribution to journalArticle

6 Scopus citations

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.

Original languageEnglish (US)
Article number072308
JournalPhysics of Plasmas
Volume25
Issue number7
DOIs
StatePublished - Jul 1 2018

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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