Research of Multi-Physics Simulation Technology
JAXA Supercomputer System Annual Report February 2021-January 2022
Report Number: R21EDA201N03
Subject Category: Aeronautical Technology
- Responsible Representative: Takashi Aoyama, Aviation Technology Directorate, Aircraft Lifecycle Innovation Hub
- Contact Information: Takashi Takahashi(takahashi.takashi@jaxa.jp)
- Members: Tomoaki Ikeda, Kenichi Kubota, Masashi Kanamori, Keita Nakamoto, Yuya Ohmichi, Atsuya Suzuki, Takashi Takahashi, Hiroki Tsujimura, Fumito Takase, Kento Yamada
Abstract
The purpose of this research is to obtain the simulaiton technology to analyze phenomana relating with multi-physics such as acoustic fluid dynamics and multi-phase flows.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
JSS2 was used to conduct the simulaiton of liquid with a particle method, which needs the resource of JSS2 to deal with tens of millions particles in a large computational domain.
Achievements of the Year
Water spray generated from a tire of an aircraft running on flooded runway was simulated using explicit MPS method, and examined the effect of the contact area between the tire and the ground. It was found that the water spray angle gets close to the experimental data by assuming the point contact. Also, we developed a coupling code of P-Flow (particle-base solver) and FaSTAR (grid-base solver), and validated it with the jet break-up problem.
Publications
– Oral Presentations
1)S. Koga, K. Kubota, Y. Iijima, S. Koike, K. Nakakita:Quasi-Full-Scale Test for Prediction Technology of Water Spray Generated by Aircraft Tire and Comparison with Numerical Analysis, Proceedings of the Fluid Dynamics Conference/Aerospace Numerical Simulation Symposium 2021 Online, 2A07, 2021.
2)H. Tsujimura, K. Kubota, T. Sato: Numerical Analysis of Water Spray from Firefighting Aircraft Using Grid and Particle Methods Coupled by
the Aerodynamic Force Model, Proceedings of the Fluid Dynamics Conference/Aerospace Numerical Simulation Symposium 2021 Online, 1E01, 2021.
3)H. Tsujimura, K. Kubota, T. Sato: Numerical Analysis of Liquid Jet Breakup Using Particle–grid Hybrid Method, 35th CFD Symposium, C10-2, 2021.
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: OpenMP
- Number of Processes: 80 – 270
- Elapsed Time per Case: 10 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 0.40
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 | 404745.21 | 0.02 |
| TOKI-ST | 2047750.06 | 2.52 |
| TOKI-GP | 0.00 | 0.00 |
| TOKI-XM | 0.00 | 0.00 |
| TOKI-LM | 255321.81 | 19.03 |
| 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 | 1262.08 | 1.26 |
| /data and /data2 | 22052.67 | 0.24 |
| /ssd | 503.33 | 0.13 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 6.32 | 0.04 |
*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) | 114.77 | 0.08 |
*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.
JAXA Supercomputer System Annual Report February 2021-January 2022