CFD and CFD-DEM coupled simulation for a large-scale PSI test
JAXA Supercomputer System Annual Report February 2024-January 2025
Report Number: R24EEE21100
Subject Category: Space Exploration
- Responsible Representative: Kota Tanabe, JAXA Space Exploration Center, Space Exploration System Technology Unit
- Contact Information: Mitsuhisa Baba(baba.mitsuhisa@jaxa.jp)
- Members: Mitsuhisa Baba
Abstract
There is a risk that during spacecraft take-off and landing, large amounts of regolith will be scattered from the ground by the engine exhaust plume and that craters will be formed. We will develop technology to properly assess this risk and provide feedback to the spacecraft itself and its operations.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
In addition to unsteady CFD analysis, coupled discrete element method (DEM) analysis is very computationally costly. Therefore, large-scale parallel computing using a supercomputer is effective.
Achievements of the Year
NASA Langley Research Center is planning a large-scale ground experiment of PSI for a lunar lander.
JAXA conducted joint research with NASA and used CFD and CFD-DEM coupled analysis to predict the results of the large-scale experiment. The results indicated that a large crater could be formed in a very short time.
Publications
N/A
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: Fujitsu MPI
- Number of Processes: 480 – 4800
- Elapsed Time per Case: 72 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 0.03
Details
Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.
System Name | CPU Resources Used(Core x Hours) | Fraction of Usage*2(%) |
---|---|---|
TOKI-SORA | 0.00 | 0.00 |
TOKI-ST | 290231.10 | 0.30 |
TOKI-GP | 0.00 | 0.00 |
TOKI-XM | 0.00 | 0.00 |
TOKI-LM | 9.76 | 0.00 |
TOKI-TST | 0.00 | 0.00 |
TOKI-TGP | 0.00 | 0.00 |
TOKI-TLM | 0.00 | 0.00 |
File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
---|---|---|
/home | 30.00 | 0.02 |
/data and /data2 | 133.33 | 0.00 |
/ssd | 133.33 | 0.01 |
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 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 2024-January 2025