Numerical study on unsteady flow fields around a re-entry capsule
JAXA Supercomputer System Annual Report April 2017-March 2018
Report Number: R17ETET12
Subject Category: Skills Acquisition System
- Responsible Representative: Takashi Takahashi, Aeronautical Technology Directorate, Numerical Simulation Research Unit
- Contact Information: Kenji Kobayashi knjkoba@chofu.jaxa.jp
- Members: Kenji Kobayashi
Abstract
Coherent structures around a re-entry capsule were investigated using the unsteady flow solver FaSTAR. A re-entry capsule shows dynamic instability in subsonic and transonic speeds. This study focused on the subsonic unsteady flow around the capsule and investigated the mechanism of the dynamic instability.
Reference URL
N/A
Reasons for using JSS2
Large computational cost is required to simulate the unsteady flow field.
Achievements of the Year
Coherent structures around a reentry capsule at M=0.4 and 0.8 were simulated. It reproduced the fluid phenomena which had frequency of St ~ 0.01 , where St is the Strouhal number. We found this frequency was close to the frequency of the dynamic instability of the capsule.
Publications
N/A
Usage of JSS2
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: N/A
- Number of Processes: 512
- Elapsed Time per Case: 700.00 hours
Resources Used
Fraction of Usage in Total Resources*1(%): 0.13
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 | 533,290.78 | 0.07 |
SORA-PP | 14,231.82 | 0.18 |
SORA-LM | 17,487.62 | 9.01 |
SORA-TPP | 0.00 | 0.00 |
File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
---|---|---|
/home | 238.42 | 0.17 |
/data | 42,480.49 | 0.79 |
/ltmp | 976.56 | 0.07 |
Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
---|---|---|
J-SPACE | 5.80 | 0.25 |
*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