Study on liquid behavior in low-garavity environments
JAXA Supercomputer System Annual Report February 2025-January 2026
Report Number: R25EDG10103
Subject Category: Research and Development
- Responsible Representative: Masato Sakurai, Manager of ECLSS, Research Unit II, Aerospace RInsertHereD Directorate, JAXA
- Contact Information: Manager of ECLSS, Research Unit II, Aerospace RInsertHereD Directorate, JAXA(sakurai.masato@jaxa.jp)
- Members: Yuki Ban, Hikono Furuichi, Motoharu Kusano, Masato Sakurai, Ichiro Ueno
Abstract
In 2022, experiments in microgravity (LBPGE) were conducted on the ISS. This research aims to accumulate knowledge on liquid behavior in low-gravity environments and to elucidate sloshing phenomena within small sealed vessel.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
In this system where surface tension dominates, it is necessary to reproduce complex interfacial behavior. This requires substantial computational resources, and utilizing JSS enables the rapid execution of massive calculations.
Achievements of the Year
We constructed a numerical simulation model similar to the LBPGE experiment and investigated the effect of the initial liquid level on liquid behavior. When oscillating at the first resonance frequency of the vessel under ground gravity conditions, resonance occurred at an initial liquid level of 9.33 mm, but not at 7.34 mm. Furthermore, at 8.00 mm, an increase in the liquid amplitude value was observed, but the magnitude of this increase was smaller compared to 9.33 mm. This clearly shows that the initial liquid volume enclosed within the vessel influences the resonance phenomenon.
Fig.1: Correlation between amplitude of interface oscillation and vessel oscillation frequency: (a) dementional and (b) non-dementional forms.
Publications
- Oral Presentations
Sloshing in a Swinging Rectangular Container: Manned Pressureized Rovers for Low Gravity Conditions, 54th International Conference on Environmental Systems
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: OpenMP
- Number of Processes: 144 - 324
- Elapsed Time per Case: 24 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 0.16
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 | 0.00 | 0.00 |
| TOKI-ST | 1344573.10 | 1.39 |
| 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 | 0.00 | 0.00 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 2.73 | 0.01 |
*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) | 0.70 | 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