Numerical Simulation on Ionization Structure and Shock Wave Propagation for Flight-performance Improvement of Beaming Propulsion Vehicle
JAXA Supercomputer System Annual Report April 2020-March 2021
Report Number: R20EACA17
Subject Category: JSS Inter-University Research
- Responsible Representative: Masayuki Takahashi, Associate Professor, Tohoku University
- Contact Information: Masayuki Takahashi(mtakahashi@rhd.mech.tohoku.ac.jp)
- Members: Masayuki Takahashi
Abstract
To achieve a better design of beaming propulsion vehicle, we numerically reproduce propagation processes of beam-supported plasma and shock wave by simulation and evaluate beam-power dependence on discharge-structure and propagation speed.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
A conputational cost becomes huge because temporal and spatial scales are different between discharge and shock wave propagation processes and a computational speed is limited by the discharge simulation. JAXA supercomputer, which has a huge calculation ability, is required to reproduce a propagation process of beam-supported plasma.
Achievements of the Year
An electromagnetic wave-plasma-shock wave-chemical reaction-radiation coupling simulation using fluid modeling indicated that a plasma propagation was sustained because radiation process induced a seed electron in front of the ionization front when a lower intensity beam was irradiated. When the beam intensity was decreased further, the propagation speed of the ionization front became slower because a thermal ionization process can be dominant on creation of the seed electron. The propagation speed obtained by the numerical simulattion had a good agreement with a tendency obtained by the experiment. We can determine the most suitable nozzle length of a beaming rocket based on the numerically estimated propagation speeds of the ionization front and shock wave.
Publications
N/A
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: N/A
- Number of Processes: 1 - 256
- Elapsed Time per Case: 10 Hour(s)
Resources Used(JSS2)
Fraction of Usage in Total Resources*1(%): 0.03
Details
Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.
| System Name | Amount of Core Time(core x hours) | Fraction of Usage*2(%) |
|---|---|---|
| SORA-MA | 172,237.19 | 0.03 |
| SORA-PP | 0.00 | 0.00 |
| SORA-LM | 0.00 | 0.00 |
| SORA-TPP | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 476.84 | 0.44 |
| /data | 9,765.63 | 0.19 |
| /ltmp | 1,953.13 | 0.17 |
| 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)
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.
| System Name | Amount of Core Time(core x hours) | Fraction of Usage*2(%) |
|---|---|---|
| TOKI-SORA | 0.00 | 0.00 |
| TOKI-RURI | 0.00 | 0.00 |
| TOKI-TRURI | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 476.84 | 0.33 |
| /data | 9,765.63 | 0.16 |
| /ssd | 95.37 | 0.05 |
| 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 2020-March 2021