Introducing unstructured mesh support to a developing gyrokinetic code, gKPSP2

Abstract

To solve governing differential equations over complex geometry, it is imperative to create and utilize unstructured mesh, in general. National Fusion Research Institute started developing a gyrokinetic simulation code, gKPSP2, to aim at a whole device modeling for real geometry of Tokamaks such as KSTAR, ITER and K-DEMO. Handling the entire domain of Tokamak is expected to require high performance parallel computation over more than 1M real space elements in addition to velocity space elements for each real space element. In this presentation, we introduce the code development in the mesh perspective and show how unstructured mesh is created for realistic Tokamak geometry and what functionalities are required to support the unstructured mesh in parallel use for gKPSP2.

* This research was supported by R&D Program of "Study of an efficient SOL discretization algorithm for global ITER burning plasma simulation (code No. IN2004-6)" through the National Fusion Research Institute of Korea (NFRI) funded by the Government funds.

Keyword : Unstructured mesh, Whole device modeling, Gyrokinetic code, High performance computing