本文へ移動

サイトナビゲーションへ移動

検索ボックスへ移動

サイドバーへ移動

ここは、本文エリアの先頭です。

Numerical Study on Ionization Structure and Shock Wave Propagation for Improving Flight Performance of Beaming Propulsion Vehcile

JAXA Supercomputer System Annual Report February 2022-January 2023

Report Number: R22EACA17

Subject Category: JSS Inter-University Research

PDF available here

  • Responsible Representative: Masayuki Takahashi, Associate Professor, Tohoku University
  • Contact Information: Masayuki Takahashi, Tohoku University(masayuki.takahashi.c8@tohoku.ac.jp)
  • Members: Soichiro Suzuki, Hoshiki Sato, Naoki Tsunezawa, Masayuki Takahashi

Abstract

In this study, our objective is designing a beaming thruster for improving its thrust performance by revealing generation mechanism of plasma and shock wave.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

It is necessary to use JAXA supercomputer because a computational cost becomes huge to reoroduce a beam-induced breakdown owing to its multi-scale physics between neutral gas dynamics, plasma reaction diffusion, and electromagnetic wave propagation.

Achievements of the Year

We numerically reproduced a multi-dimensional plasma-front propagation induced by a beam irradiation using a coupling simulation code between neutral gas dynamics, plasma reaction diffusion, and electromagnetic wave propagation. A diffusive plasma was obtained at low beam intensity, and a discrete plasma was induced at high beam intensity. The wave reflected by the plasma was examined by putting vertual antennas in the simulation domain, which indicated that a high frequency wave was induced by the discrete plasma. Moreover, a plasma-front propagation speed was measured by monitoring the waves reflected by the plasma. These results indicated that the plasma structure can be identified by using antennas, instead of utilization of optical devices such as high-speed camera.

Publications

N/A

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 48 – 480
  • Elapsed Time per Case: 48 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.15

 

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 461433.33 0.02
TOKI-ST 1025241.94 1.02
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 550.00 0.50
/data and /data2 16340.00 0.13
/ssd 400.00 0.06

 

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.

JAXA Supercomputer System Annual Report February 2022-January 2023