Irreversible data compression concepts with polynomial fitting in time-order of particle trajectory for visualization of huge particle system

24th IUPAP Conference on Computational Physics

物理学;计算机科学

Ohtani, H.^1,2 ; Hagita, K.^3 ; Ito, A.M.^1 ; Kato, T.^4 ; Saitoh, T.^5 ; Takeda, T.^6

Department of Helical Plasma Research, National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan^1

Department of Fusion Science, Graduate University for Advanced Studies (SOKENDAI), 322-6 Oroshi-cho, Toki 509-5292, Japan^2

Department of Applied Physics, National Defense Academy of Japan, 1-10-20 Hashirimuzu, Yokosuka 239-8686, Japan^3

Department of Physical Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi Hiroshima 739-8526, Japan^4

Interactive Research Center of Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan^5

Center for Computational Astrophysics, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka 181-8588, Japan^6

关键词: Compression scheme;    Galaxy formations;    Irreversible compression;    Particle simulations;    Particle trajectories;    Polynomial fittings;    Polynomial functions;    Simulation variables;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/454/1/012078/pdf
DOI  :  10.1088/1742-6596/454/1/012078

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We propose in this paper a data compression scheme for large-scale particle simulations, which has favorable prospects for scientific visualization of particle systems. Our data compression concepts deal with the data of particle orbits obtained by simulation directly and have the following features: (i) Through control over the compression scheme, the difference between the simulation variables and the reconstructed values for the visualization from the compressed data becomes smaller than a given constant. (ii) The particles in the simulation are regarded as independent particles and the time-series data for each particle is compressed with an independent time-step for the particle. (iii) A particle trajectory is approximated by a polynomial function based on the characteristic motion of the particle. It is reconstructed as a continuous curve through interpolation from the values of the function for intermediate values of the sample data. We name this concept «TOKI (Time-Order Kinetic Irreversible compression)». In this paper, we present an example of an implementation of a data-compression scheme with the above features. Several application results are shown for plasma and galaxy formation simulation data.