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Study of combustion instability

JAXA Supercomputer System Annual Report February 2022-January 2023

Report Number: R22ECMP16

Subject Category: Competitive Funding

PDF available here

  • Responsible Representative: Seiji Tsutsumi, Research and Development Directorate, Research Unit III
  • Contact Information: Seiji Tsutsumi(tsutsumi.seiji@jaxa.jp)
  • Members: Junya Aono, Hiroyuki Ito, Noriyasu Omata, Seiji Tsutsumi

Abstract

In this study, LS-FLOW-HO was used to conduct a two-dimensional LES analysis of Continuously Variable Resonant CoContinuously Variable (CVRC) with varying inlet oxidizer temperature. Then, the database with and without combustion instability was generated. We will develop a reduced order model that can predict combustion conditions to predict combustion instability by integrating model-based analysis and machine learning approach.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Even in two-dimensional LES analysis, the computational time is so long that results can not be obtained without the use of a large-scale supercomputer.

Achievements of the Year

Two-dimensional LES analysis wass carried out for Continuously Variable Resonant CoContinuously Variable (CVRC) by using LS-FLOW-HO. In this simulation, the temperature of the oxidizer in the inlet duct was gradually changed from 680 K. And, the database with and without combustion instability is being prepared. We aim to develop a model to predict the occurrence of combustion instability in CVRC.

Publications

N/A

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: OpenMP
  • Number of Processes: 48
  • Elapsed Time per Case: 400 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.04

 

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 1031012.40 0.04
TOKI-ST 2563.27 0.00
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 82.57 0.07
/data and /data2 13656.69 0.11
/ssd 51.45 0.01

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 99.16 0.44

*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)
74.25 0.05

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

JAXA Supercomputer System Annual Report February 2022-January 2023