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Numerical Study of Breakdown and Shock Wave Structures for Improvement of Flight Perofmrnace in a Beamed-energy Vehicle

JAXA Supercomputer System Annual Report April 2019-March 2020

Report Number: R19EACA17

Subject Category: JSS2 Inter-University Research

PDF available here

  • Responsible Representative: Masayuki Takahashi, Associate Professor, Tohoku University
  • Contact Information: Masayuki Takahashi(mtakahashi@rhd.mech.tohoku.ac.jp)
  • Members: Masayuki Takahashi

Abstract

The microwave-driven in-tube accelerator concept was proposed as a novel beamed-energy propulsion system, and breakdown and shock wave propagations are numerically reproduced to compare with conventional system.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

It is necessary to use the JAXA supercomputer because multiscale physics, which has plasma transport, neutral gas compression and expansion, and electromagnetic wave proapgation, is simulated and a computational cost becomes high.

Achievements of the Year

Electromagnetic wave propagation, plasma drift-diffusion, and shock wave propagation were numerically reproduced in the microwave-driven in-tube accelerator, which indicated that the electromagnetic wave was focused at the rear of the vehicle and plasma was generated. A shock wave was induced because the plasma transported energy to neutral particles, and we can obtain thrust. The microwave-driven in-tube accelerator concept is a hopeful transporation system because its thrust performance is higher than concentional system.

Publications

– Peer-reviewed papers

Masayuki Takahashi and Naofumi Ohnishi, “Gas Propellant Dependency of Plasma Structure and Thrust Performance of Microwave Rocket,” Journal of Applied Physics, Vol. 125, 163303 (2019).

Usage of JSS2

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 1 – 100
  • Elapsed Time per Case: 50 Hour(s)

Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.11

 

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 961,450.13 0.12
SORA-PP 0.00 0.00
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 476.84 0.40
/data 9,765.63 0.17
/ltmp 1,953.13 0.17

 

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.

JAXA Supercomputer System Annual Report April 2019-March 2020