Research and Development on Aircraft Certification DX(Flyability)

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25ECMP50

Subject Category: Competitive Funding

PDF[reppdfreadiness2025 e]

Responsible Representative: Atsushi Hashimoto, XANADU Project Team, Aviation Technology Directorate
Contact Information: Takashi Ishida, XANADU Project Team, Aviation Technology Directorate(ishida.takashi@jaxa.jp)
Members: Atsushi Hashimoto, Kenji Hayashi, Yuki Ide, Takashi Ishida, Seigo Koga, Yoimi Kojima, Yoimi Kojima, Hiroya Toriida, Takahiro Yamamoto, Ryoh Takahashi, David Lusher, Andrea Sansica

Abstract

This project corresponds to a joint proposal by domestic heavy industry manufacturers and JAXA for "Key and Advanced Technology R&D through Cross Community Collaboration Program / Innovation of aircraft design, certification, production processes and process integration" (hereinafter referred to K Program), which NEDO solicited publicly. The K Program is required to implement four major items from FY2023 to FY2027, one of which is Certification DX for this project.

In order to promote an efficient certification process while ensuring safety, Certification DX will demonstrate highly practical CbA (Certification by Analysis) in cooperation with aircraft manufacturers, certification authority, and international WGs, and establish CbA guidelines. The objective is to integrate the design, certification, and production processes on a digital platform using a system model based on MBSE (Model Based Systems Engineering). Specific activities planned include the establishment of CbA guidelines for structure, flight, and lightning, CbA mock reviews, and the application of MBSE to the CP (Certification Plan).

Reference URL

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

Reasons and benefits of using JAXA Supercomputer System

In this project, CbA for trim and static stability in longitudinal, lateral and directional directions will be demonstrated through comparison with flight test data, and guidelines for flight CbA will also be developed. JSS is planned to be used for the analysis necessary for these purposes.

In developing guidelines for flight CbA, JSS use is necessary in the following perspectives:

(i)It is necessary to parametrically combine multiple control surfaces and perform a huge number of simulations to compare with flight test data,

(ii)RANS simulation using FaSTAR also requires a large computational cost due to the need to capture turbulent phenomena in detail,

(iii)Grid refinement for takeoff configuration, V&V for RANS simulations, and unsteady flow simulations increases the number of grid points and requires large computational resources,

(iv)Internal resources must be used to maintain the confidentiality of the geometry data.

Achievements of the Year

Towards the demonstration of CbA for longitudinal, lateral and directional trim and static stability, a large number of parametric combinations of flight conditions and control surfaces were simulated to build an aerodynamic database for the flight dynamics simulator. In addition, a grid convergence study using grid families and a parametric study for turbulence model coefficients were conducted to evaluate the uncertainty of CFD. Through these activities, a CFD Verification, Validation, and Uncertainty Quantification (VVUQ) process was established.

These results were obtained as a result of work (JPNP22007) commissioned by the New Energy and Industrial Technology Development Organization (NEDO).

Publications

- Oral Presentations

1)Ishida, T., et al., "Efforts to Build a Process to Realize Flight CbA," Proceedings of the 63rd JSASS Aircraft Symposium, JSASS-2025-5200, Okinawa, Japan, June 2025.

2)Takeda, T., "Research and Development on Certification DX," Oral presentation at the 3rd Open Forum of the CompreHensive Aviation INnovation by digital TRANSformation (CHAIN-X) Consortium, Ochanomizu SolaCity, Tokyo, Japan, December 2025. (in Japanese)

- Web

https://www.aero.jaxa.jp/news/event/pdf/event251202/chain-x2025_07.pdf

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 480 - 2400
Elapsed Time per Case: 60 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 6.33

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	168654239.46	7.65
TOKI-ST	427768.72	0.44
TOKI-GP	0.00	0.00
TOKI-XM	1433.36	0.49
TOKI-LM	7382.20	0.56
TOKI-TST	1162.24	0.02
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	2048.00	3.28
/data and /data2	204800.00	1.35
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	48.66	0.15

*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)	2431.43	1.70

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