JAXA Supercomputer System Annual Report (April 2018-March 2019)

Research on High-Speed Rotorcraft Technology
Report Number: R18EA3304
Subject Category: Aeronautical Technology
URL: https://www.jss.jaxa.jp/en/ar/e2018/9086/
Responsible Representative
Yasutada Tanabe, Senior Researcher, Aeronautical Technology Directorate, Aviation Systems Unit
Contact Information
Yasutada Tanabe, Aviation Systems Unit, Aeronautical Technology Directorate (tan@chofu.jaxa.jp)
Members
Yasutada Tanabe, Hideaki Sugawara, Masahiko Sugiura
Abstract
Aiming to achieve a flight speed as high as twice of the conventional helicopters, a new concept of compoundhelicopter is proposed. Key technologies such the system integration, remarkable reduction of the aerodynamic
drag and optimized rotor design are investigated.

Reasons for using JSS2
The newly proposed compound helicopter utilizes 4 rotor/propellers. CFD analysis involving the whole aircraft
requires large amount of memories and long-time computations. Super-computers such as the JSS2 is a must
infrastructure for this kind of research.
Achievements of the Year
Wind-tunnel testing using the conceptual model of the proposed compound helicopter is carried out and basic
aerodynamic data are obtained which will be used to validate the CFD analysis results. Also, rotor/winginteractions which contribute to a large amount of the aerodynamc drag of the whole aircraft are simulated andthe drag increases due to the interaction are collected. The rotor optimization for high-speed flight is also underway.
A photo of the concetual model during wind-tunnel testing is shown in Fig. 1, and a sample of CFD simulation
for the whole aircraft configuration is shown in Fig. 2.

－105－This document is provided by JAXA.

JAXA Special Publication JAXA-SP-19-003E

Fig. 1: Photo of the concetual model during wind-tunnel testingFig. 2: A sample of the CFD simulation for a full-configuration of the conceptual modelPublications- Non peer-reviewed papers
1) Yasutada Tanabe, Masahiko Sugiura, Noboru Kobiki and Hideaki Sugawara, A New Concept of Compound
Helicopter and Flight Tests, 2018 Asia Pacific International Symposium on Aerospace Technology, Chengdu,China, Oct 16-18, 2018.
2) Hideaki Sugawara, Yasutada Tanabe, Noriaki Itoga, Masaharu Kameda, Numerical Simulation ofAerodynamicInteraction Between a Rotor and a Wing, 7th Asian/Australian Rotorcraft Forum, Jeju Island, Korea,
Oct 30 - Nov 1, 2018.

－106－This document is provided by JAXA.

JAXA Supercomputer System Annual Report (April 2018-March 2019)

Usage of JSS2

Computational Information
Process Parallelization Methods

N/A

Thread Parallelization Methods

OpenMP

Number of Processes

1

Elapsed Time per Case

240 Hour (s)Resources Used
Fraction of Usage in Total Resources*1 (%): 0.77
Details
Computational Resources
System Name

Amount of Core Time(core x hours)

Fraction of Usage*2 (%)

SORA-MA

1,221,581.65

0.15

SORA-PP

342,839.46

2.74

SORA-LM

0.00

0.00SORA-TPP

464,168.85

33.95

File System Resources
File System Name

Storage Assigned (GiB)

Fraction of Usage*2 (%)/home

133.51

0.14/data

6,510.42

0.11/ltmp

759.550.07

Archiver Resources
Archiver Name

Storage Used (TiB)

J-SPACE

Fraction of Usage*2 (%)
0.00

0.00

*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.

－107－This document is provided by JAXA.