AMITIS: A 3D GPU-Based Hybrid-PIC Model for Space and Plasma Physics

11th International Conference on Numerical Modeling of Space Plasma Flows

Fatemi, Shahab^1,3 ; Poppe, Andrew R.^1,3 ; Delory, Gregory T.^1,3 ; Farrell, William M.^2,3

Space Sciences Laboratory, University of California, Berkeley

CA, United States^1

NASA Goddard Space Flight Center (GSFC), Greenbelt

MD, United States^2

Solar System Exploration Research Virtual Institute (SSERVI), NASA Ames Research Center, Moffett Field

CA, United States^3

关键词: Advanced modeling;    Implicit schemes;    Implicit solvers;    Macroscopic properties;    Moving particles;    Parallel computing platform;    Simulation outputs;    Space simulations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/837/1/012017/pdf
DOI  :  10.1088/1742-6596/837/1/012017

来源: IOP

【 摘 要 】

We have developed, for the first time, an advanced modeling infrastructure in space simulations (AMITIS) with an embedded three-dimensional self-consistent grid-based hybrid model of plasma (kinetic ions and fluid electrons) that runs entirely on graphics processing units (GPUS). The model uses NVIDIA GPUS and their associated parallel computing platform, CUDA, developed for general purpose processing on GPUS. The model uses a single CPU-GPU pair, where the CPU transfers data between the system and GPU memory, executes CUDA kernels, and writes simulation outputs on the disk. All computations, including moving particles, calculating macroscopic properties of particles on a grid, and solving hybrid model equations are processed on a single GPU. We explain various computing kernels within AMITIS and compare their performance with an already existing well-tested hybrid model of plasma that runs in parallel using multi-CPU platforms. We show that AMITIS runs ∼10 times faster than the parallel CPU-based hybrid model. We also introduce an implicit solver for computation of Faraday's Equation, resulting in an explicit-implicit scheme for the hybrid model equation. We show that the proposed scheme is stable and accurate. We examine the AMITIS energy conservation and show that the energy is conserved with an error