Research on particle simulation methods
JAXA Supercomputer System Annual Report February 2025-January 2026
Report Number: R25EDA201G19
Subject Category: Aeronautical Technology
- Responsible Representative: Yasuhiro Mizobuchi, Project Manager, Aviation Technology Directorate, Aircraft Digital Transformation Technology Demonstration (XANADU) Project Team
- Contact Information: Hiroki Tsujimura(tsujimura.hiroki@jaxa.jp)
- Members: Kenichi Kubota, Keita Nakamoto, Hiroki Tsujimura
Abstract
This research aims to acquire simulation technology using particle methods, known to be useful for simulating multi-physics phenomena, to accelerate aircraft development.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
JSS3 is used because simulations that involve tens of millions of particles in a large computation domain requires parallel computing and a large amount of memory, which is not available on usual workstations.
Achievements of the Year
We are currently researching numerical models related to droplet deformation, breakup, and freezing to numerically simulate liquid fuel atomization and airfoil icing using the Moving Particle Simulation (MPS) method. This year, first, we made improvements on our surface tension and wettability model and evaluated them by solving simple problems such as oscillation of an elliptical droplet and droplet impingement on a solid wall. Second, to evaluate the aerodynamic force applied to droplet surfaces caused by external airflow, we applied the immersed solid method to airflow calculations using the finite volume method and coupled it with the MPS method. Droplet breakup was simulated to validate the method. Our research of the next year will focus on applying the above method to large-scale problems.
Publications
- Peer-reviewed papers
Hiroki Tsujimura, Kenichi Kubota, Crystallization and isothermal freezing model for particle simulation of supercooled liquid droplet impingement, International Journal of Computational Fluid Dynamics, 38 (2025). DOI: 10.1080/10618562.2025.2469499
- Oral Presentations
Hiroki Tsujimura, Kenichi Kubota, Numerical analysis of droplet breakup by coupling particle method and immersed solid method for aircraft icing prediction, 43rd Aerospace Numerical Simulation Symposium, Tokyo, 2025.
Hiroki Tsujimura, Kenichi Kubota, Moving particle simulation of droplet breakup coupled with immersed body method, IX International Conference on Particle-based Methods, Barcelona, 2025.
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: OpenMP
- Number of Processes: 1 - 10
- Elapsed Time per Case: 1 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 0.00
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 | 395.47 | 0.00 |
| TOKI-ST | 1915.01 | 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 Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 0.00 | 0.00 |
| /data and /data2 | 0.00 | 0.00 |
| /ssd | 0.00 | 0.00 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 0.00 | 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) | 101.46 | 0.07 |
*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.
JAXA Supercomputer System Annual Report February 2025-January 2026