JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EBA50100

Subject Category: Aeronautical Technology

PDF (to be added)

• Responsible Representative: Yoshikazu Makino, Aviation Technology Directorate, Re-BooT Project Team
• Contact Information: Hiroaki Ishikawa(ishikawa.hiroaki2@jaxa.jp)
• Members: Junichi Akatsuka, Hiroaki Ishikawa, Shinya Koganezawa, Masashi Kanamori, Satoshi Kondo, Ryo Shimada, Hajime Miki, Yukinori Morita, Yusuke Naka, Takuya Ogura, Atsushi Shinozuka, Kensuke Soneda, Hisato Takeda, Atsushi Ueno, Tatsunori Yuhara, Minoru Yoshimoto, Riki Matsuyama

Abstract

This project aims to contribute to the realization of commercial supersonic aircraft capable of supersonic flight over land and to the promotion of Japanese aircraft manufacturing industry related to supersonic aircraft. The project will conduct flight demonstrations of robust low-boom design technology, which is a key technology, design a practical supersonic concept aircraft, contribute to the establishment of civilian supersonic aircraft standards, and conduct ground demonstrations and research and development of related technologies.

Reference URL

Please refer to https://www.aero.jaxa.jp/eng/research/frontier/sst/ .

Reasons and benefits of using JAXA Supercomputer System

The development of a flight demonstrator aircraft that demonstrates robust low-boom design technology requires accurate numerical simulation to estimate aerodynamic performance and sonic boom characteristics. JSS is used to accurately and efficiently estimate the aerodynamic characteristics of complex geometries and to design a low-boom supersonic flight demonstrator aircraft.

Achievements of the Year

A high-fidelity external geometry model reproducing the as-built configuration of the flight demonstrator was developed by minimizing the fairings covering actuators required for actual flight and redesigning detailed components such as control surfaces and winglet attachment fittings.

CFD analyses were conducted using this model, and based on the resulting aerodynamic data, sonic boom signatures to be validated in flight tests were estimated.

As a result of these studies, the final configuration of the flight demonstrator was established, and various sonic boom signatures expected to occur during flight demonstration were predicted using JSS.

The estimated sonic boom signatures were confirmed to be consistent with those assumed at the design phase, thereby demonstrating the validity of the demonstrator configuration and the adopted robust low boom design cocept.

Fig.1: CFD analysis around the flight demonstrator (pressure distribution on the surface and symmetry plane)

Fig.2: Estimated sonic boom signatures considering the assumed flight trajectory

Publications

- Oral Presentations

Masashi Kanamori, Shinya Koganezawa, Hiroaki Ishikawa, Atsushi Ueno, Yusuke Naka and Yoshikazu Makino, "Numerical analyses of sonic boom waveforms in flight test of JAXA's Robust en-route sonic-Boom mitigation Technology demonstration (Re-BooT) Project," ASA/ASJ joint meeting, 2aNSb2, 2025

Usage of JSS

Computational Information

• Process Parallelization Methods: MPI
• Thread Parallelization Methods: Automatic Parallelization
• Number of Processes: 960 - 2400
• Elapsed Time per Case: 14 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 2.03

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