Innovative Green Aircraft Technology : High Efficiency and Low Noise Aircraft

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25ETET15

Subject Category: Skills Acquisition System

Responsible Representative: Atsusi Kanda, Aeronautical Technology Directorate, Aviation Enviromental Sustanability Innovation Hub
Contact Information: Dongyoun Kwak, Aviation Enviromental Sustanability Innovation Hub(kwak.dongyoun@jaxa.jp)
Members: Nozomu Hayabe, Yasushi Ito, Shinya Koganezawa, Dongyoun Kwak, Mitsuhiro Murayama, Takuto Masaki, Tsubasa Ogoshi, Kazuhiro Takeoka

Abstract

The purpose of the iGreen research is to develop and mature a bunch of advanced and innovative technologies on aerodynamics, aeroacoustics, and structures to enable airframe design with higher environmental performances. In addition to verifying practical application of these technologies, we will also work on the development of elemental and system technologies.

Reference URL

Please refer to https://www.aero.jaxa.jp/eng/research/ecat/igreen/ .

Reasons and benefits of using JAXA Supercomputer System

CFD analysis are used for the understanding of aerodynamic characteristics and evaluation of the performance in the aircraft design phase. Huge calculation resources and costs were required for the high fidelity and quick response CFD analysis for the optimum aerodynamic design process on complex aircraft geometry. JSS3 can achieve those requirements, the cost and time are drastically saved on the CFD analysis.

Achievements of the Year

In this research, fundemental technologies to improve the environmental performance of subsonic aircraft, such as low fuel consumption and low noise, are studied in collaboration with universities. One key area of investigation is the Boundary Layer Ingestion (BLI) engine. The design integrates the engine with the fuselage to ingest the boundary layer developed on the aircraft surface, thereby enabling drag reduction. BLI engine on the upper surface of the fuselage is expected to reduce ground noise, as the airframe helps shield engine noise. However, there are concerns that inlet distortion may lead to increased noise. In this study, CFD analysis of fan flow with and without boundary layer ingestion was performed to investigate changes in the flow field and pressure fluctuations that affect acoustic characteristics.

Fig.1: CFD analysis of fan flow with Boundary Layer Ingestion

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 64 - 3840
Elapsed Time per Case: 170 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.67

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	14777867.73	0.67
TOKI-ST	1049759.81	1.09
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	31.39	0.00
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	4.88	0.01

*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)	1167.53	0.82

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