Study on numerical analysis of unsteady compressible flow field

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25ETET00

Subject Category: Skills Acquisition System

Responsible Representative: Kazuyuki Nakakita, Aviation Technology Directorate, Fundamental Aeronautics Research Unit
Contact Information: Ken Fujino(kenfujino0508@g.ecc.u-tokyo.ac.jp)
Members: Ken Fujino

Abstract

Recently, data-driven analysis on unsteady fluid dynamics dataset has been widely conducted. In the present study, we apply data-driven analysis methods to unsteady phenomena near stall in low-speed regime and transonic buffet phenomena around airfoil. By applying them, we try to understand and clarify the target unsteady phenomena.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

In this research project, we conduct large-eddy simulation (LES) to calculate unsteady phenomena near stall in the low-speed regime and transonic buffet around airfoil. Performing LES requires large numerical expenses. Therefore, it is necessary to use JAXA Supercomputer System in the present project.

Achievements of the Year

In this year, we calculated flow field of the low-speed low Reynolds number regimes and transonic high-Reynolds-number regimes around laminar airfoil. By applying the data-driven analysis method, the causal relationship between different frequency phenomena was discussed with the obtained numerical results.

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 50 - 100
Elapsed Time per Case: 200 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.35

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name	CPU Resources Used (Core x Hours)	Fraction of Usage*2(%)
TOKI-SORA	9450116.20	0.43
TOKI-ST	0.00	0.00
TOKI-GP	10907.13	0.18
TOKI-XM	0.00	0.00
TOKI-LM	567.24	0.04
TOKI-TST	0.00	0.00
TOKI-TGP	0.00	0.00
TOKI-TLM	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	0.00	0.00
/data and /data2	0.00	0.00
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	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.

ISV Software Licenses Used

ISV Software Licenses Resources
	ISV Software Licenses Used (Hours)	Fraction of Usage*2(%)
ISV Software Licenses (Total)	0.00	0.00

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.