DSMC analysis of the rarefied gas flows
JAXA Supercomputer System Annual Report April 2017-March 2018
Report Number: R17EG3214
Subject Category: Research and Development
- Responsible Representative: Eiji Shima, Resarch and Development Directorate, Resarch Unit III
- Contact Information: Hideyo Negishi negishi.hideyo@jaxa.jp
- Members: Hiroaki Amakawa, Takayuki Ito, Hideyo Negishi, Yoichi Ohnishi, Miki Nishimoto, Yu Daimon, Ashvin Hosangadi, Masaaki Ino, Osamu Fukasawa, Shinji Ohno, Andrea Zambon, Takenori Nakajima, YUKA Akimura, Takashi Amemiya, Hironori Fujiwara, Hiroumi Tani, Takuya Iimura, Keiichiro Fujimoto, Tetsufumi Ohmaru, AKIKO Kotani, Taroh Fukuda, Mayu Matsumoto, Masashi Toyama, Daiki Muto, Susumu Teramoto, Takahiko Toki
Abstract
To understand the rearfield gas flow phenomenon in high altitude and outer space, which is difficult to conduct ground test, and to predict the aerodynamic / thermal environment for reentry and the thermal load of gas plume from a thruster, we aim to develop a practical tool that can deal with actual shape and short analysis period.
Reference URL
Please refer to ‘Research on software, computational engineering, and verification technology | JAXA|Research and Development Directorate‘.
Reasons for using JSS2
In order to respond timely to project requirements, it is necessary to simulate complex geometries of actual spacecraft and to analyze a large number of conditions in a short period.
Achievements of the Year
We evaluated the risk of abnormally high temperature due to the interaction between the thruster plume and the loading of the HTV-X by using the rarefield gas flow analysis tool developed at Research Unit III. It predicted the plume interaction and the heat load with the loading. We contributed to changing the RCS thruster attachment position and angle. Figure 1 shows the simulation result of HTV-X.
Fig.1(video): Plume simulation for HTV-X, number of density distribution
Publications
■ URLs for the Research Results on the Web
1) http://www.kenkai.jaxa.jp/eng/research/software/software.html
Usage of JSS2
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: N/A
- Number of Processes: 300 – 625
- Elapsed Time per Case: 50.00 hours
Resources Used
Fraction of Usage in Total Resources*1(%): 0.99
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 | 8,234,867.05 | 1.08 |
SORA-PP | 1,337.81 | 0.02 |
SORA-LM | 4.64 | 0.00 |
SORA-TPP | 11.25 | 0.00 |
File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
---|---|---|
/home | 509.62 | 0.35 |
/data | 25,306.17 | 0.47 |
/ltmp | 16,404.39 | 1.24 |
Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
---|---|---|
J-SPACE | 0.24 | 0.01 |
*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 2017-March 2018