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Research of numerical prediction for the flight stability

JAXA Supercomputer System Annual Report February 2023-January 2024

Report Number: R23EDA201G26

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Kazuyuki Nakakita, Aeronarutical Technology Directorate, Aircraft Life Cycle Innovation Hub
  • Contact Information: Yoimi Kojima(kojima.yoimi@jaxa.jp)
  • Members: Katsuhito Kozawa, Yoimi Kojima, Hideji Saiki

Abstract

The flight stability of aircraft is necessary to establish safe flight. We aim to improve the technology level of flight stability prediction through numerical simulation. The numerical method is validated and analyzed for developing better numerical tools.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Unsteady simulations required for the stability analysis demand large computational resources and produce much data. JSS allows us to simulate and analysis of numerical results.

Achievements of the Year

We conducted several unsteady numerical simulations with forced roll oscillation to analyze roll instability of a high-mobility aircraft. The Spalart-Allmaras model based delayed detached eddy simulation (DDES) method is used as a turbulence model. The visualization of unsteady flow over the main wing indicates that the interaction between the shock wave and separation is the source of the roll instability.

Fig.1(video): Shock (blue) and separation (red) interaction over the main wing

Publications

– Oral Presentations

1) Yoimi Kojima, Akiko Hidaka, Shinji Nagai, “Numerical Analysis of Roll Instability Phenomenon in Transonic Flow over a SDM,” 56th FDC/42nd ANSS, 2023. (In Japanese)

2) Yoimi Kojima, Akiko Hidaka, Shinji Nagai, “Numerical Analysis of Uncommanded Lateral-Directional Motions of SDM in Transonic Flow,” AIAA SciTech Forum 2024, 2024.

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 1152 – 3456
  • Elapsed Time per Case: 300 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 1.56

 

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 42317253.84 1.91
TOKI-ST 8845.67 0.01
TOKI-GP 0.00 0.00
TOKI-XM 80.08 0.04
TOKI-LM 246.63 0.02
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 37.73 0.03
/data and /data2 34326.12 0.21
/ssd 386.15 0.04

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 26.78 0.10

*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)
25.59 0.01

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

JAXA Supercomputer System Annual Report February 2023-January 2024