Numerical calculation for electric propulsion

JAXA Supercomputer System Annual Report April 2020-March 2021

Report Number: R20EDU10500

Subject Category: Space and Astronautical Science

Responsible Representative: Kazutaka Nishiyama, Department of Space Flight Systems
Contact Information: Kazutaka Nishiyama(nishiyama@ep.isas.jaxa.jp)
Members: Yusuke Yamashita, Kazutaka Nishiyama, Takato Morishita

Abstract

We analyze a neutralizer cathode plasma of the microwave discharge ion thruster, which is the main engine of the asteroid explorer Hayabusa and Hayabusa2.

We are conducting numerical analysis to investigate the degradation factors of the neutralizer in Hayabusa and develop the high-performance neutralizers for future missions.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

In general, the numerical calculation of plasma has a high calculation cost.

We conduct research efficiently with the JAXA supercomputer, which has one of the best calculation performance in Japan.

Achievements of the Year

We analyzed the neutral particle flow inside the discharge chamber of a microwave discharge neutralizer. We investigated the distribution of neutral particle density in the discharge chamber by the DSMC method (Fig. 1). We designed a calculation model of the neutralizer of the Hayabusa2 flight model.

Fig.1: Neutral particle density distribution in the discharge chamber

Publications

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Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 2 – 12
Elapsed Time per Case: 6 Hour(s)

Resources Used(JSS2)

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

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

Computational Resources
System Name	Amount of Core Time (core x hours)	Fraction of Usage*2(%)
SORA-MA	9,060.69	0.00
SORA-PP	2,877.42	0.02
SORA-LM	0.00	0.00
SORA-TPP	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	246.37	0.23
/data	4,962.29	0.10
/ltmp	2,604.17	0.22

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.

Resources Used(JSS3)