JAXA Supercomputer System Annual Report April 2018-March 2019

Report Number: R18EDA201N13

Subject Category: Aeronautical Technology

PDF available here

• 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 100 times compared with the current level of CFD runs. We aim to develop a “many-block method” that can complete a single case of turbulent combustion LES in an extremely short time period.

Reference URL

N/A

Reasons for using JSS2

We used JSS2 for developing a LES code by a “many-block method” that has inner cells for high-order interpolation inside an unstructured cell, and for performing LES analysis with 100 million grid points.

Achievements of the Year

In this research, we developed a LES code by “many-block method” that has inner cells for high-order interpolation 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).

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”, 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 CFD Sympoium, C08-3, 2018.

– Oral Presentations

1) Shingo Matsuyama, “High-order Unstructured-grid Large Eddy Simulation Using Many-block Method”, the 50th 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 Used

Fraction of Usage in Total Resources*1(%): 0.00

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

*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.

JAXA Supercomputer System Annual Report April 2018-March 2019