Numerical Simulations for H3 Rocket Development

JAXA Supercomputer System Annual Report April 2019-March 2020

Report Number: R19EK2302

Subject Category: Space Technology

PDF available here

Responsible Representative: Masashi Okada, Space Technology Directorate I, H3 Project Team
Contact Information: Hideyo Negishi(negishi.hideyo@jaxa.jp)
Members: Kuniyuki Takekawa, Seiji Tsutsumi, Masashi Kanamori, Masaaki Ino, Hironori Fujiwara, Masaharu Abe, Hiroyuki Ito, Shinji Ohno, Takenori Nakajima, Hideyo Negishi, Yu Daimon, Takanori Haga, Taro Shimizu, Junya Aono, Tetsufumi Ohmaru, Taroh Fukuda, Masashi Toyama, Osamu Fukasawa, Kohki Tao

Abstract

Please refer to the following URL: http://global.jaxa.jp/projects/rockets/h3/

Reference URL

N/A

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 is because 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 in terms 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 JSS2. In FY2019, numerical simulations of the combustion chamber and turbopump design were performed to improve their designs and contributed to the LE-9 engine development.

Publications

N/A

Usage of JSS2

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: FLAT
Number of Processes: 128 – 16000
Elapsed Time per Case: 300 Hour(s)

Resources Used

Fraction of Usage in Total Resources*1(%): 13.81

Details

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

Computational Resources
System Name	Amount of Core Time (core x hours)	Fraction of Usage*2(%)
SORA-MA	125,280,237.90	15.23
SORA-PP	15,096.88	0.10
SORA-LM	8,765.75	3.66
SORA-TPP	2.17	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	10,919.58	9.09
/data	91,673.05	1.57
/ltmp	4,300.14	0.37

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	123.94	3.12

*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.