本文へ移動

サイトナビゲーションへ移動

検索ボックスへ移動

サイドバーへ移動

ここは、本文エリアの先頭です。

Numerical Simulation of the Acoustic Characteristics of Hartmann Generator

JAXA Supercomputer System Annual Report February 2022-January 2023

Report Number: R22EDA101C11

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Tatsuya Ishii, Aeronautical Technology Directorate, Aviation Environmental Sustainability Innovation Hub
  • Contact Information: Noise and Vibration Reduction Technology team, Aviation Environmental Sustainability Innovation Hub, Aeronautical Technology Directorate(enomoto.shunji@jaxa.jp)
  • Members: Taichi Fujimoto, Shunji Enomoto, Tatsuya Ishii

Abstract

Numerical analysis of a fluid interference generator, which generates high sound pressure that can affect the structure of the flow field, for the purpose of reducing the noise generated by the exhaust jet of an aero engine.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

The computational performance of the JAXA supercomputer was necessary to perform the calculations on a large number of Hartmann generator geometries.

Achievements of the Year

The objective of this year’s study was to understand the basic acoustic characteristics of the Hartmann generator. The pressure fluctuations produced by the Hartmann generator were reproduced numerically, and acoustic analysis of the far field was conducted to study the directivity of the sound pressure level and the difference in sound power. Figure is an example of a visualization movie of the calculation results. By performing a series of calculations, we were able to obtain fundamental knowledge such as at what position the resonance tube of the Hartmann generator should be placed to increase the sound power.

Fig.1(video): Example of numerical analysis of Hartmann generator (Mach number)

Publications

N/A

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: OpenMP
  • Number of Processes: 32
  • Elapsed Time per Case: 22 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.07

 

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 1615299.67 0.07
TOKI-ST 19905.42 0.02
TOKI-GP 0.00 0.00
TOKI-XM 0.00 0.00
TOKI-LM 0.00 0.00
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 17.69 0.02
/data and /data2 104863.08 0.81
/ssd 493.85 0.07

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 20.86 0.09

*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)
1632.37 1.14

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

JAXA Supercomputer System Annual Report February 2022-January 2023