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

Research and development for system integration of silent supersonic airplane technologies

Report Number: R18EA3800
Subject Category: Aeronautical Technology
URL: https://www.jss.jaxa.jp/en/ar/e2018/9087/
Responsible Representative
Yoshikazu Makino, Aeronautical Technology Directorate, Aviation Systems Research Unit
Contact Information
Yoshikazu Makino (makino.yoshikazu@jaxa.jp)
Members
Junichi Akatsuka, Naoko Tokugawa, Hiroaki Ishikawa, Yoshine Ueda, Yoshikazu Makino, Dongyoun Kwak,Keisuke Ohira, Atsushi Ueno, Satoshi Kondo, Tatsunori Yuhara, Jun Matsumoto, Kana Yamagiwa, Miki Oosawa,Hajime Miki
Abstract
Currently, airplanes fly at about Mach 0.8, which is markedly slower than the speed of sound. From Japan, whichis distant from Europe and the United States, it takes more than 12 hours to fly the distance. If we were able to fly
faster than the speed of sound, for example at twice the speed, then the time for flying would be halved and theflight duration from Japan to Europe or the United States would be about 6 hours. If the travelling time wereshortened, then economic activities would be bolstered by increased opportunities for business and tourism.
Moreover, measures against natural disasters could be taken quickly, thereby ushering in a safer and more affluent
society. If the flight duration were less than 6 hours, then the increasing frequency of hazards, nuisances, andailments such as economy-class syndrome could be prevented. Perhaps most importantly, everyone would be able
to enjoy travel more comfortably than ever. These airplanes that enable high-speed transportation, which fly at aspeed faster than the speed of sound, are called supersonic civil transport. Although the realization of supersonic
civil transport is highly anticipated, successors to the Concorde, which was retired in 2003, have not been
forthcoming. Shortcomings of the Concorde included poor fuel consumption and extremely high operational costs.
In addition, because sonic booms are created, supersonic flight over land was not permitted. Its routes wereseverely restricted, which is another reason that business success eluded the Concorde. During flight experiments
in 2005, using NEXST-1, a small supersonic experimental plane, JAXA demonstrated a technology to reduce airresistance and to improve fuel consumption efficiency. The D-SEND project first phase test was conducted in
2011. The second phase test was conducted in 2015, in an attempt to verify the concept of an airframe design
technology for sonic boom abatement. As described, key technologies will be acquired to meet the requirementsof supersonic passenger aircraft and to present JAXA’s original low sonic boom design concept model, “Quieter
supersonic civil transport”.
Ref. URL: http://www.aero.jaxa.jp/eng/research/frontier/sst/－93－

This document is provided by JAXA.

JAXA Special Publication JAXA-SP-19-003E

Reasons for using JSS2
In the R&D for system integration of silent supersonic airplane technologies, the airplane design study of asmall-size civil supersonic transport is conducted. Simulations for evaluating the aerodynamic performance andnoise characteristics are conducted using JAXA supercomputer system.
Achievements of the Year
Numenrical simulations were conducted at high-alpha and low-speed flight conditions on a quiet SST
configuration (QSST) with the Krueger leading-edge flap. The numerical solutions show good agreement withexperimental results on vortices dominant flow field. The fidelity of the CFD analysis which adjusted analysis
condition by previous studies could be confirmed. (Fig. 1)

Fig. 1: CFD analysis on a QSST configuration with HLD devices

Publications- Non peer-reviewed papers
Kwak, D. and Ohira, K., Preliminary Study of the Aerodynamic Characteristics of Krueger Flap on the SST
Configuration, the 31st ICAS Congress, Belo Horizonte, Brazil, 9-14, Sep. 2018.
Usage of JSS2
Computational Information
Process Parallelization Methods

MPIThread Parallelization Methods

N/A

Number of Processes

512 - 1024

Elapsed Time per Case

8 Hour (s)－94－This document is provided by JAXA.

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

Resources Used
Fraction of Usage in Total Resources*1 (%): 0.99
Details
Computational Resources
System Name

Amount of Core Time(core x hours)

Fraction of Usage*2 (%)

SORA-MA

8,031,133.67

0.98

SORA-PP

185,118.99

1.48

SORA-LM

4,842.59

2.26

SORA-TPP

0.00

0.00

File System Resources
File System Name

Storage Assigned (GiB)

Fraction of Usage*2 (%)/home446.21

0.46/data

15,246.87

0.27/ltmp

11,621.10

1.00

Archiver Resources
Archiver Name

Storage Used (TiB)

J-SPACE

Fraction of Usage*2 (%)
6.52

0.23

*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.

－95－

This document is provided by JAXA.