Study on spacecraft dynamics

JAXA Supercomputer System Annual Report February 2024-January 2025

Report Number: R24ECWU24

Subject Category: Cooperative Graduate School System

Responsible Representative: Yusuke Maru, Associate Professor, Institute of Space and Astronautical Science
Contact Information: Yusuke Maru(maru.yusuke@jaxa.jp)
Members: Hiroto Aoyagi, Shoya Koshino, Ryota Miyajima, Kazuma Matsumoto, Yuma Miki, Takumi Ohno, Keisuke Takahashi, Daiki Watanabe, Tsubasa Watabe, Maiko Yamakawa

Abstract

Specifically, we performed (1) a performance analysis of the air intake of an air-breathing engine installed on a space transport aircraft, (2) an evaluation of the interference between the thruster jet and the surface of a celestial body when a lander lands on the celestial body, and (3) an analysis of the flow characteristics of an electric pump for supplying propellant to a spacecraft.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Each of these themes is being carried out in a complementary manner with experiments, and by using JSS3, analyses can be performed extremely quickly, making it possible to carry out numerical analysis that is effective in setting experimental conditions and understanding experimental results.

Achievements of the Year

(1) We evaluated the flow characteristics of the air intake of an air-breathing engine mounted on a vertical take-off and landing rocket just before landing. Figure 1 shows the Mach number contours of the flow field in a typical configuration.

(2) We evaluated the interference between the thruster jet and the surface of a celestial body when a lander lands on the celestial body. Figure 2 shows the analysis results (Mach number contour) of the thruster jet flow assuming the shape of the celestial body.

(3) We performed a flow field analysis of a cascade pump, which is focused on as an electric pump for supplying propellant to spacecraft. Figure 3 shows an example of the flow field analysis results.

Fig.1: Example of flow field analysis result of backflow suction

Fig.2: Thruster jet flow analysis and experimental observations

Fig.3: Flow field around the cascade pump blades

Publications

- Oral Presentations

1) Maiko Yamakawa, Taiga Tokuoka, Yusuke Maru, Shujiro Sawai, Yu Daimon, Takahiro Ito, Yuichi Tsuda, Osamu Mori, DISPERSAL BEHAVIOR OF CELESTIAL SURFACE OBJECTS BY THRUSTER JET, IAC2024, Milan

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 256
Elapsed Time per Case: 8.3 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.22

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	3541487.16	0.16
TOKI-ST	302292.54	0.31
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	15330.09	1.11
TOKI-TST	10141.66	0.18
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	2094.00	1.41
/data and /data2	195060.00	0.93
/ssd	31120.00	1.67

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)	5380.90	3.68

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