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Acoustic Liner Program for High-bypass-ratio Aircraft engines

JAXA Supercomputer System Annual Report February 2023-January 2024

Report Number: R23EDA101P00

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Tatsuya Ishii, Director of Aviation Environmental Sustainability Innovation Hub, Aviation Technology Directorate
  • Contact Information: Shunji ENOMOTO(enomoto.shunji@jaxa.jp)
  • Members: Hideaki Matsuura, Daisuke Sasaki, Junichi Oki, Shunji Enomoto,

Abstract

Ultra high bypass ratio aviation jet engines have a smaller sound absorbing liner area than conventional engines. In this project, we will develop sound-absorbing device technology that provides high noise reduction performance even with a small-sized sound-absorbing liner.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

To perform many LES calculations by changing the shape of the sound absorbing liner, the calculation performance and the storage capacity of JAXA supercomputer system were required.

Achievements of the Year

Acoustic liners contribute to the reduction of noise in jet engines, but they induce aerodynamic drag. The performance characteristics of acoustic liners vary depending on the shape of the orifices. In this study, we employ UPACS-LES with a compact scheme for analysis of three-dimensional turbulent flow in single acoustic liner model. Inflow Mach number is 0.3. Computations are conducted for three different orifice shapes: a Square, a Z-slit, a Round. Figure 1 shows that the flow goes into the orifices. Computational results indicate that the drag on the square orifice is higher compared to the other orifices. To investigate the reasons. The figure provides a graphical representation of the Reynolds stress distribution on the orifice surface. The figure indicates that the Reynolds stress for the square orifice is generally higher than that of the others, and it shows particularly large values near the sides. The figure illustrates the formation of vortices on both sides of the orifice. The vortices descend along the wall and rotate. This occurs only in the square orifice, thus this is the reason for the high drag.

Annual Reoprt Figures for 2023

Fig.1: Instantaneous Data of Round Orifice

 

Annual Reoprt Figures for 2023

Fig.2: Distribution of Reynolds Stress of Orifice

 

Annual Reoprt Figures for 2023

Fig.3: Vortices of Square Orifice

 

Publications

– Poster Presentations

H. Matsuura, D. Sasaki, S. Enomoto, and J. Oki, Computational Estimation of Drag on an Acoustic Liner under Three-Dimensional Turbulent Flow, ICCFD12, (2024-07-14).

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: OpenMP
  • Number of Processes: 128 – 140
  • Elapsed Time per Case: 120 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.15

 

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 3987107.21 0.18
TOKI-ST 28435.79 0.03
TOKI-GP 0.00 0.00
TOKI-XM 0.00 0.00
TOKI-LM 3460.80 0.26
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 986.92 0.82
/data and /data2 169375.38 1.04
/ssd 10426.15 0.98

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 15.01 0.05

*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)
589.43 0.27

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

JAXA Supercomputer System Annual Report February 2023-January 2024