Aerodynamic analysis of Japan's next generation primary launch vehicle

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EEG60101

Subject Category: Research and Development

Responsible Representative: Hideaki Nanri, Director of Research Unit 4, Research and Development Directorate, Research Unit 4
Contact Information: Hideaki Ogawa(ogawa.hideaki@jaxa.jp)
Members: Fumihiro Itoo, Mizuki Murakami, Yukinori Morita, Takuya Ogura, Minoru Yoshimoto, Hideaki Ogawa

Abstract

Japan's next generation primary launch vehicle which reuses the first stage is being studied in order to reduce the space transportation cost drastically. The aerodynamic characteristics in the reentry phase is estimated analyticaly to evaluate the feasibility of vehicle system design using the analytical results.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Many cases of aerodynamic characteristics data of the 1st stage for wind tunnel test are needed in order to evaluate the flight feasibility of the launch vehicle in the reentry phase.

JAXA super computer system is used to prepare the data set in a short period and supports the quick feasility study.

Achievements of the Year

Numerical simulations using various CFD solvers were performed to be compared with the results from experimental testing using the same conditions. These results included the analytical results on many cases of aerodynamic characteristics data of the reusable 1st stage. This means the flight trajectory analysis of the vehicle can be improved and the flight environmental condition of the vehicle becomes able to be estimated more precisely. The analytical results with JSS were thus beneficial because designing from the perspective of progressing the design of the vehicle system and components.

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 480 - 3840
Elapsed Time per Case: 24 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.31

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	8244666.29	0.37
TOKI-ST	20.11	0.00
TOKI-GP	0.00	0.00
TOKI-XM	1727.97	0.59
TOKI-LM	1946.53	0.15
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	0.46	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.