JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EDU10308

Subject Category: Space and Astronautical Science

PDF (to be added)

• Responsible Representative: Yusuke Maru, Associate Professor, Institute of Space and Astronautical Science
• Contact Information: Yusuke Maru(maru.yusuke@jaxa.jp)
• Members: Yusuke Maru, Tasuku Miyazaki, Shingo Matsuyama, Yuma Miki, Takumi Ohno, Daiki Watanabe, Tsubasa Watabe

Abstract

We are conducting technological research essential for realizing a space transportation system that actively and effectively utilizes the Earth's atmosphere. Specifically, we are performing design studies of air intakes for air breathing engines.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

We run JAXA's analysis tools, FaSTAR and CHARIOT, on the JSS supercomputer to investigate the flow characteristics inside the air intake. FaSTAR is used for design studies of the flow path, where various conditions are systematically varied. In contrast, CHARIOT is employed for detailed analysis of the physical phenomena within the flow field. Both analyses require large-scale computations, making the use of the supercomputer indispensable.

Achievements of the Year

(1) Flow-field analyses were performed using FaSTAR for the intake flow-path geometry designed with Busemann's method. In addition, the pressure distribution obtained from wind-tunnel experiments for the same geometry was compared with the CFD results to evaluate the validity of the CFD analysis (Figs. 1 & 2).

(2) High-fidelity CFD was applied to the intake flow field, and the results were compared with both the wind-tunnel experimental data and the RANS-based CFD results (Fig. 3).

Fig.1: Comparison of the pressure distributions between the wind-tunnel experimental results and the RANS CFD results

Fig.2: Mach number counter of RANS CFD results during intake started.

Fig.3: High-fidelity CFD results (Mach number contours)

Publications

- Peer-reviewed papers

Kazuma MATSUMOTO, Haruaki SETA, Daiki WATANABE, Yusuke MARU, Tetsuya SATO, Experimental and Numerical Investigation of a Three-Dimensional Supersonic Inlet for the Reusable Sounding Rocket with ATRIUM Engine, Journal of Evolving Spa

- Oral Presentations

Yuma Miki, Tasuku Miyazaki, Kiyoshi Kinefuchi, Yusuke Maru, Hiroaki Kobayashi, Shinichiro Tokudome and Tetsuya Sato, Subscale Suction Test of an Airframe-integrated Busemann Intake for an Airbreathing Rocket,35th International Symposium on Shock Waves, Brisbane, Australia, July 2025.

Yusuke MARU, Kazuma MATSUMOTO, Daiki WATANABE, Daichi UTSUNOMYA, Takumi ONO, Tetsuya SATO, Yuma MIKI, Tasuku MIYAZAKI, Kiyoshi KINEFUCHI, Shingo MATSUYAMA, A Three-Dimensional Busemann Inlet Ingesting Boundary Layer, ISTS35 2025 July

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(%): 0.17

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

*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

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

JAXA Supercomputer System Annual Report February 2025-January 2026