Performance tuning of a CFD code on the Earth Simulator

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

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 journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	115-120
Number of pages	6
Journal	NEC Research and Development
Volume	44
Issue number	1
Publication status	Published - Jan 1 2003
Externally published	Yes

Keywords

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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AU - Uno, Atsuya

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AU - Saito, Minoru

AU - Ishihara, Takashi

AU - Kaneda, Yukio

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AB - 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.

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KW - DNS (Direct Numerical Simulation)

KW - Earth Simulator

KW - FFT (Fast Fourier Transform)

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