Particle behavior simulation using a 1-way DEM-CFD Method in a Gas Sampling System.

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25ECWU20

Subject Category: Cooperative Graduate School System

Responsible Representative: Inatomi Yuko,Department of Interdisciplinary Space Science, Institute of Space and Astronautical Science
Contact Information: Mao Takata(mao.takata@ac.jaxa.jp)
Members: Mao Takata

Abstract

This study aims to investigate particle behavior in a gas sampling system that collects surface material by blowing regolith particles away using a high-pressure gas jet. The particle dynamics are examined through numerical simulation.Using the axisymmetric velocity and density distributions obtained in advance from computational fluid dynamics (CFD) analyses performed on a supercomputer, particle motion is reproduced by employing a one-way DEM-CFD method in which fluid drag forces and wall contact forces are applied to the particles. This method enables simulation of particle motion and dispersion behavior during gas injection.Based on the simulation results, this study evaluates how surface particles are lifted by the jet and subsequently collected as samples.

Reference URL

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Reasons and benefits of using JAXA Supercomputer System

This study aims to investigate particle behavior in a gas sampling system that collects surface material by blowing regolith particles away using a high-pressure gas jet through numerical simulation. In order to accurately reproduce particle dynamics, detailed flow field information, such as velocity and density distributions generated by the high-pressure gas jet, is indispensable. However, computational fluid dynamics (CFD) analyses targeting such high-pressure and high-speed flows require enormous computational costs, and the resulting increase in computation time can significantly affect research progress.By utilizing the JAXA supercomputer, it becomes possible to efficiently conduct large-scale, high-resolution fluid analyses. This enables a substantial reduction in computation time while obtaining highly accurate flow field data, thereby improving the reliability of particle behavior simulations and accelerating the overall progress of the research

Achievements of the Year

By utilizing the JAXA supercomputer, we were able to perform comparative fluid analyses using various viscosity models, as well as comparisons of fluid simulation results based on different mesh generation strategies for the computational domain.

Publications

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Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 18 - 36
Elapsed Time per Case: 5 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.01

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	19223.34	0.02
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	0.00	0.00
/data and /data2	0.00	0.00
/ssd	0.00	0.00

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)	418.36	0.29

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.