Research and Development of Emission Free Aircraft Technologies

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EDA102H01

Subject Category: Aeronautical Technology

Responsible Representative: Akira Nishizawa, Aeronautical Technology Directorate
Contact Information: Yuzuru Yokokawa(yokokawa.yuzuru@jaxa.jp)
Members: Ryutaro Furuya, Sena Hattori, Hiroshi Kobayashi, Yuki Kishi, Takayuki Sakurai, Keisuke Sugaya, Hirotaka Tsutsui, Keiji Ueshima, Kanako Yasue, Yuzuru Yokokawa

Abstract

With the ultimate goal of achieving emission-free (zero emissions) aircraft, research and development of electric hybrid propulsion system is conducted, which includes the WAT(Wake Adaptive Thruster) fans at the end of fuselage, and new configuration of electric aircraft that apply them, as well as system demonstration project.

Reference URL

Please refer to https://www.aero.jaxa.jp/eng/research/program/megawatt/ .

Reasons and benefits of using JAXA Supercomputer System

The JSS3 is used to design a passenger aircraft equipped with an turbo-electric hybrid propulsion system. Because a huge computational resource is required to handle both thermodynamics and aerodynamics of fully configurated aircraft, JSS3 is essential for the execution of this research and development.

Achievements of the Year

This year, the design of a transonic wind tunnel test model (Fig. 1, Fig. 2) and preliminary prediction analysis for an electric hybrid aircraft with WAT fan was conducted, as well as aerodynamic performance improvements of the WAT fan nacelle. FaSTAR-Move with a propulsion fan model analysis module was used as a solver, which includs interference with the propulsion system. In addition, an analysis to improve the lift and drag ration of the main wing was also conducted.

Fig.1: Comparison of Tail Shapes in the Transonic Wind Tunnel Test Model

Fig.2: Comparison of the WAT Fan Nacelle Plug Shapes for the Transonic Wind Tunnel Test Model

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 36 - 768
Elapsed Time per Case: 12 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 1.20

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	31475295.39	1.43
TOKI-ST	135523.17	0.14
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	986.85	0.07
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	1024.00	1.64
/data and /data2	102400.00	0.67
/ssd	30720.00	1.87

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	19.94	0.06

*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)	345.17	0.24

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