JAXA Supercomputer System Annual Report (February 2022-January 2023)

Numerical Simulations for H3 Rocket Development

Report Number: R22EK2302
Subject Category: Space Technology
URL: https://www.jss.jaxa.jp/en/ar/e2022/20869/
Responsible Representative
Masashi Okada, Space Transporation Technology Directorate, H3 Project Team
Contact Information
Hideyo Negishi(negishi.hideyo@jaxa.jp)
Members
Junya Aono, Masaharu Abe, Hiroaki Amakawa, Yu Daimon, Taroh Fukuda, Hironori Fujiwara, Osamu Fukasawa,Yuma Fukushima, Takanori Haga, Hiroyuki Ito, Masashi Kanamori, Shingo Matsuyama, Hideyo Negishi,
Takenori Nakajima, Shinji Ohno, Taro Shimizu, Seiji Tsutsumi, Kuniyuki Takekawa, Masashi Toyama, SatoshiUkai, Keita Yamamoto, Rika Yamada
Abstract
Please refer to the following URL: http://global.jaxa.jp/projects/rockets/h3/
Ref. URL: https://global.jaxa.jp/projects/rockets/h3/
Reasons and benefits of using JAXA Supercomputer System
Risk management is the key to make a success of a large-scale development project like H3 rocket. This isbecause its development schedule and cost could be significantly influenced by the face of imminent risks when
new technologies are under system-level verification and validation. In order to complete the project under defined
period and cost, a variety of efforts are essential for planning and process of technology development itself interms of efficiency and certainty. In that context, numerical simulation technologies and JSS2 have been playing
one of major roles to make the H3 project success.
Achievements of the Year
With regard to the booster engine, 'LE-9', under detailed design phase, evaluation of design and risks as well as
studies for improvement were carried out by making full use of JSS3. In FY2022, numerical simulations of thecombustion chamber and turbopump design were performed to improve their designs and contributed to the LE9 engine development.

Publications
N/A- 610 -JAXA Supercomputer System Annual Report (February 2022-January 2023)

Usage of JSS⚫

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Computational Information

Process Parallelization Methods

MPI

Thread Parallelization Methods

FLAT

Number of Processes

128 - 16000

Elapsed Time per Case

300 Hour(s)JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 17.71
Details
Computational Resources
System Name
TOKI-SORACPU Resources Used(core x hours)Fraction of Usage*2(%)

479,107,663.75

20.90

TOKI-ST

447,989.53

0.45

TOKI-GP

79.72

0.00

TOKI-XM

21,102.50

13.20

TOKI-LM

11,413.62

0.76

TOKI-TST

182,557.49

4.81

TOKI-TGP

0.00

0.00

TOKI-TLM

2,798.14

5.81- 611 -JAXA Supercomputer System Annual Report (February 2022-January 2023)

File System Resources
File System Name

Storage Assigned (GiB)/home/data and /data2

Fraction of Usage*2 (%)

2,935.95

2.66

481,465.09

3.71

5,725.64

0.79/ssd
Archiver Resources
Archiver Name

Fraction of Usage*2 (%)

Storage Used (TiB)

J-SPACE

193.240.86*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.

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ISV Software Licenses Used
ISV Software Licenses Resources
ISV Software Licenses Used

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

3,659.45*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.

- 612 -2.55