Research on device development for decarbonized core engines

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EDA201J06

Subject Category: Aeronautical Technology

Responsible Representative: Kazuyuki Nakakita, Aeronautical Technology Directorate, Fundamental Aeronautics Research Unit
Contact Information: Taisuke Nambu(nambu.taisuke@jaxa.jp)
Members: Koetsu Ito, Shingo Matsuyama, Taisuke Nambu, Naoyuki Okamura, Kei Shimura, Masahiro Takagi

Abstract

To achieve carbon neutrality by 2050, we research and develop technologies that enable decarbonization in core engines and verify their applicability. Specifically, we will conduct experimental and numerical research and development on combustor technologies that use hydrogen.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

JSS is necessary to complete large scale numerical simulations of unsteady phenomena and to understand it in short time span.

Achievements of the Year

Using tests conducted with a JAXA‑designed hydrogen combustor as the validation target, we clarified the accuracy of the exit temperature distribution predicted by JAXA's numerical analysis tool (HINOCA‑AE). At present, we have confirmed that the tool can predict the distribution with an error of approximately 100K compared to the test results.

In addition, based on the above hydrogen combustion test rig, we created a simplified model combustor geometry that enables DNS of hydrogen combustor flows. DNS is currently being conducted on this model combustor. Using the DNS results, we plan to propose prototype turbulent combustion models applicable to hydrogen RQL combustors.

Fig.1: LES results for JAXA's hydrogen combustor using HINOCA‑AE (time‑averaged temperature distribution)

Fig.2: DNS results for the model combustor (temperature distribution)

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 1 - 1534
Elapsed Time per Case: 240 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.60

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	15537605.41	0.70
TOKI-ST	3319.22	0.00
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	84.82	0.01
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	102400.00	0.67
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	30.49	0.09

*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)	1736.58	1.22

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