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Chapter and Conference Paper
An Asymptotic Parallel Linear Solver and Its Application to Direct Numerical Simulation for Compressible Turbulence
When solving numerically partial differential equations such as the Navier-Stokes equations, higher-order finite difference schemes are occasionally applied for spacial descretization. Compact finite differenc...
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Chapter and Conference Paper
File I/O Cache Performance of Supercomputer Fugaku Using an Out-of-Core Direct Numerical Simulation Code of Turbulence
Turbulent flows play important roles in many flow-related phenomena that appear in various fields. However, despite numerous studies on turbulence, the nature of turbulence has not yet been fully clarified. Di...
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Chapter and Conference Paper
Optimizations of DNS Codes for Turbulence on SX-Aurora TSUBASA
Direct numerical simulations (DNSs) of incompressible turbulence have been performed since the late 1960s, but simulations that reproduce strongly nonlinear turbulent flows as in the real-world have not been r...
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Chapter and Conference Paper
Affecting the Relaxation Parameter in the Multifrontal Method
Numerical solutions of a large sparse linear system of equations are often appeared in numerical simulations. In many cases, the computational time to solve it accounts for a large portion of the total simulat...
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Chapter and Conference Paper
Performance of a Two-Path Aliasing Free Calculation of a Spectral DNS Code
A direct numerical simulation (DNS) code was developed for solving incompressible homogeneous isotropic turbulence with high Reynolds numbers in a periodic box using the Fourier spectral method
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Article
Improving the energy efficiencies of power supply and cooling facilities for 10 peta-scale supercomputer
We report our operational experience of improving the energy efficiency of the power supply and cooling facilities of the K computer. By optimizing the number of active air handlers, the blowout temperature an...
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Chapter and Conference Paper
Feasibility Study of a Future HPC System for Memory Intensive Applications: Conceptual Design of Storage System
We started a feasibility study of high-end computing systems as a 2-year national project in 2012 for exa-scale computing era. In order to realize the exa-scale system, it is extremely important to design a la...
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Chapter and Conference Paper
Accurate Parallel Algorithm for Tracking Inertial Particles in Large-Scale Direct Numerical Simulations of Turbulence
Statistics on the motion of small heavy (inertial) particles in turbulent flows with a high Reynolds number are physically fundamental to understanding realistic turbulent diffusion phenomena. An accurate para...
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Article
The design of ultra scalable MPI collective communication on the K computer
This paper proposes the design of ultra scalable MPI collective communication for the K computer, which consists of 82,944 computing nodes and is the world’s first system over 10 PFLOPS. The nodes are connecte...
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Chapter and Conference Paper
High-Resolution Direct Numerical Simulation of Turbulence — Spectra of Fourth-Order Velocity Moments —
High-resolution direct numerical simulations (DNSs) of incompressible turbulence based on an alias-free spectral method were performed on the Earth Simulator. Statistics of turbulence are studied by a DNS on 1024
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Chapter and Conference Paper
An MPI Benchmark Program Library and Its Application to the Earth Simulator
Parallel programming is essential for large-scale scientific simulations, and MPI is intended to be a de facto standard API for this kind of programming. Since MPI has several functions that exhibit similar be...
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Chapter and Conference Paper
Basic design of the earth simulator
The Earth Simulator is an ultra high-speed supercomputer. The research and development of the Earth Simulator started in 1997 as one of the approaches in the Earth Simulator project which aims at the promotion...
