Simulation of High-Speed Rotorcraft

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EDA201C20

Subject Category: Aeronautical Technology

Responsible Representative: Kanako Yasue, Aviation Technology Directorate, Aviation Integration Innocation Hub
Contact Information: Hideaki Sugawara(sugawara.hideaki@jaxa.jp)
Members: Fumihiro Kajiwara, Yuki Kishi, Keita Kimura, Hideaki Sugawara, Ryo Takahashi, Yasutada Tanabe, Kanako Yasue

Abstract

This study investigates technologies for high-speed rotorcraft. The objectives are to enhance main rotor performance and reduce airframe drag to enable high-speed flight. To improve rotor performance, CFD-based optimization and advanced insights into rotor aerodynamics are employed. For airframe drag reduction, non-streamlined components, such as the rotor hub, are examined, with the aim of developing effective drag-reduction devices.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

To perform a large number of computational simulations, an efficient high-performance computer is required.

Achievements of the Year

Previously developed hub drag reduction technologies were extended to a medium-sized helicopter model to assess their effectiveness at the system level beyond component-level evaluations. A full-configuration CFD analysis was conducted to decompose the drag components, quantify the contribution of hub drag to the total drag, and identify the primary drag sources. Based on these analyses, drag reduction devices were developed, and their effectiveness was demonstrated through both CFD simulations and wind tunnel experiments.

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 480 - 1440
Elapsed Time per Case: 336 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.82

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	12967840.28	0.59
TOKI-ST	2439624.39	2.53
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	19.82	0.00
TOKI-TST	495122.61	8.09
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	102400.00	0.67
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	6.42	0.02

*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)	563.37	0.39

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