JAXA Supercomputer System Annual Report (April 2018-March 2019)

Development of a Many-block Method for Enabling an Extremely Fast Combustion LES
Report Number: R18EDA201N13
Subject Category: Aeronautical Technology
URL: https://www.jss.jaxa.jp/en/ar/e2018/9133/
Responsible Representative
Shingo Matsuyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
Contact Information
Shingo Matsuyama (smatsu@chofu.jaxa.jp)
Members
Shingo Matsuyama
Abstract
In this research, by the following two approaches: (1) acceleration of time integration by implicit time integration
method and (2) acceleration of calculation using an accelerator, we try to achieve a speedup of more than 100times compared with the current level of CFD runs. We aim to develop a “many-block method” that can completea single case of turbulent combustion LES in an extremely short time period.
Reasons for using JSS2
We used JSS2 for developing a LES code by a “many-block method” that has inner cells for high-orderinterpolation inside an unstructured cell, and for performing LES analysis with 100 million grid points.
Achievements of the YearIn this research, we developed a LES code by “many-block method” that has inner cells for high-orderinterpolation inside an unstructured cell. We performed an LES analysis for a cylinder at Re = 3900 with about 63
million unstrectured hexa-cells (Figs. 1 and 2).

－39－This document is provided by JAXA.

JAXA Special Publication JAXA-SP-19-003E

Fig. 1: Example of unstructured hexa-cells around a cylinder. A single hexa-cell has
5x5x5 subcells in its inside. Cited from non peer-reviewed paper [2].

Fig. 2: Instantaneous contours of vorticity magnitude on the x-y plane for the LES
around a cylinder at Re = 3900. Cited from non peer-reviewed paper [2].

Publications- Non peer-reviewed papers
1) Shingo Matsuyama, “High-order Unstructured-grid Large Eddy Simulation Using Many-block Method”,－40－This document is provided by JAXA.

JAXA Supercomputer System Annual Report (April 2018-March 2019)

Proceedings of the 50th Fluid Dynamics Conference / the 36th Aerospace Numerical Simulation Symposium,
3E02, 2018.
2) Shingo Matsuyama, “Unstructured-grid LES Using Many-block Method”, Proceedings of the 32nd CFDSympoium, C08-3, 2018.
- Oral Presentations
1) Shingo Matsuyama, “High-order Unstructured-grid Large Eddy Simulation Using Many-block Method”, the50th Fluid Dynamics Conference / the 36th Aerospace Numerical Simulation Symposium, 2018.
2) Shingo Matsuyama, “Unstructured-grid LES Using Many-block Method”, the 32nd CFD Sympoium, 2018.

Usage of JSS2


Computational Information
Process Parallelization Methods

MPI

Thread Parallelization Methods

OpenMP

Number of Processes

64 - 256

Elapsed Time per Case

48 Hour (s)Resources UsedFraction of Usage in Total Resources*1 (%): 0.00Details
Computational Resources
System Name

Amount of Core Time(core x hours)

Fraction of Usage*2 (%)

SORA-MA

5,106.17

0.00

SORA-PP

0.00

0.00

SORA-LM

0.00

0.00

SORA-TPP

0.00

0.00

File System Resources
File System Name

Storage Assigned (GiB)

Fraction of Usage*2 (%)/home

399.29

0.41

/data

1,899.35

0.03

/ltmp

325.520.03－41－This document is provided by JAXA.

JAXA Special Publication JAXA-SP-19-003E

Archiver Resources
Archiver Name

Storage Used (TiB)

J-SPACE

Fraction of Usage*2 (%)
0.00

0.00

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System,and Archiver).
*2: Fraction of Usage: Percentage of usage relative to each resource used in one year.

－42－

This document is provided by JAXA.