Numerical analysis on atomization and spray combustion
JAXA Supercomputer System Annual Report February 2025-January 2026
Report Number: R25EA2150
Subject Category: Aeronautical Technology
- Responsible Representative: Junichi Kazawa, Japan Aerospace Exploration Agency, Aeronautical Technology Directorate, Aviation Environmental Sustainability Innovation Hub
- Contact Information: Kazuaki Matsuura, Japan Aerospace Exploration Agency, Aeronautical Technology Directorate, Aviation Environmental Sustainability Innovation Hub(matsuura.kazuaki@jaxa.jp)
- Members: Kazuaki Matsuura, Kinya Saito, Kodai Kato, Jun Iino, Naoki Nakamura, Mitsumasa Makida
Abstract
A numerical study is performed to clarify phenomena on atomization and spray combustion.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
Phenomena on atomization and spray combustion require a high calculation load, and the use of super computer is necessary.
Achievements of the Year
Numerical simulations were performed to investigate combustion instabilities on a coaxially-staged lean-burn fuel injector.
For response of fuel flow rate on back pressure oscillation, a quasi-steady-type response model was employed.
An example of results is shown in Figure 2.
Fig.1: Major part of numerical mesh for the combustor.
Fig.2: Time evolution of pressure at a monitoring position in the combustion chamber.
Publications
N/A
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: N/A
- Number of Processes: 512 - 2400
- Elapsed Time per Case: 200 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 1.45
Details
Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.
| System Name | CPU Resources Used(Core x Hours) | Fraction of Usage*2(%) |
|---|---|---|
| TOKI-SORA | 30736362.71 | 1.39 |
| TOKI-ST | 2661797.01 | 2.76 |
| 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 Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 0.00 | 0.00 |
| /data and /data2 | 102400.00 | 0.67 |
| /ssd | 30720.00 | 1.87 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 0.09 | 0.00 |
*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 Used(Hours) | Fraction of Usage*2(%) | |
|---|---|---|
| ISV Software Licenses(Total) | 6.13 | 0.00 |
*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.
JAXA Supercomputer System Annual Report February 2025-January 2026