Performance tuning of a CFD code on the Earth Simulator

Ken'ichi Itakura, Atsuya Uno, Mitsuo Yokokawa, Minoru Saito, Takashi Ishihara, Yukio Kaneda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


High-resolution direct numerical simulations (DNSs) of incompressible turbulence with numbers of grid points up to 20483 have been executed on the Earth Simulator (ES). The DNSs are based on the Fourier spectral method, so that the equation for mass conservation is accurately solved. In DNSs based on the spectral method, most of the computation time is consumed in calculating the three-dimensional (3D) Fast Fourier Transform (FFT). In this paper, we tuned the 3D-FFT algorithm for the Earth Simulator and have achieved DNS at 16.4TFLOPS on 20483 grid points.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalNEC Research and Development
Issue number1
Publication statusPublished - Jan 1 2003
Externally publishedYes


  • CFD (Computational Fluid Dynamics)
  • DNS (Direct Numerical Simulation)
  • Earth Simulator
  • FFT (Fast Fourier Transform)
  • Performance Tuning

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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