Rotary gas-liquid separator for use under gas-rich conditions

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EDG10104

Subject Category: Research and Development

PDF (to be added)

Responsible Representative: Manager of ECLSS, Research Unit 2, Aerospace RInsertHereD Directorate, JAXA
Contact Information: Masato Sakurai(sakurai.masato@jaxa.jp)
Members: Yuki Ban, Masato Sakurai, Ichiro Ueno

Abstract

This study focuses on RSA for gas-rich, gas-liquid two-phase flow generated by Sabatier reaction.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Numerical analysis of centrifuges makes it possible to evaluate various physical properties such as local flow rates that cannot be measured in experimental systems. In these studies, large computational resources are required to reproduce the complex mechanisms of centrifuges, and the use of JSS makes it possible to perform a large number of calculations at high speed.

Achievements of the Year

To develop a Rotary gas-liquid Separator Accumulator (RSA), we performed simulations under gravity and microgravity conditions to understand the effect of gravity on the liquid. We then compared the liquid distribution inside (Fig. 1). The results showed that liquid accumulates in the center of the RSA under microgravity. However, this phenomenon was not seen under gravity. This shows that relying on only ground experiments might underestimate the risk of liquid accumulation in space.

Fig.1: Interface behavior inside the enclosure: (a) gravity, (b) microgravity (The interface is set at a liquid content of 0.5, and the color gradually fades with depth).

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 72 - 288
Elapsed Time per Case: 120 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.73

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name	CPU Resources Used (Core x Hours)	Fraction of Usage*2(%)
TOKI-SORA	0.00	0.00
TOKI-ST	6318613.35	6.54
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 Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	1024.00	1.64
/data and /data2	204800.00	1.35
/ssd	30720.00	1.87

Archiver Resources
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 Resources
	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.