Gas-Liquid Two Phase Flow Behavior Related to ECLSS
JAXA Supercomputer System Annual Report February 2024-January 2025
Report Number: R24ECWU77
Subject Category: Cooperative Graduate School System
- Responsible Representative: Masato Sakurai, Manager of ECLSS, Research Unit II, Aerospace RInsertHereD Directorate, JAXA
- Contact Information: Masato Sakurai(sakurai.masato@jaxa.jp)
- Members: Hikono Furuichi, Motoharu Kusano, Gaku Murakami, Masato Sakurai
Abstract
Elucidate the effects of gravity on gas-liquid two-phase flows to develop separation techniques for gas-liquid two-phase flows generated by the operation of the Environment Control and Life Support System (ECLSS).
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
To establish gas-liquid separation technology, it is necessary to evaluate the interfacial behavior of gas-liquid two-phase flows under the influence of gravity. Large-scale and high-speed numerical simulations are essential for conducting this research on Earth, and the vast computational resources provided by JSS are crucial.
Achievements of the Year
In order to investigate the effect of surface properties in a container on gas-liquid two-phase flow, the behavior of gas-liquid two-phase flow in a sealed container with hydrophobic wall surfaces was examined. It was found that the hydrophobic wall surface suppressed the liquid behavior more than the hydrophilic wall surface.(Figure 1)
Fig.1: Liquid behavior in containers with different wall wettability (i) hydrophobic model (ii) hydrophilic model
Publications
- Oral Presentations
Effect of gravity conditions on Sloshing Phenomena in Sealed Vessel
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(%): 0.04
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 | 155959.12 | 0.16 |
| 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 | 245.00 | 0.17 |
| /data and /data2 | 155985.00 | 0.75 |
| /ssd | 33230.00 | 1.78 |
| 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) | 0.00 | 0.00 |
*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.
JAXA Supercomputer System Annual Report February 2024-January 2025