Study on Unstability of the re-entry capsule at Transonic Speed
JAXA Supercomputer System Annual Report April 2016-March 2017
Report Number: R16E0106
- Responsible Representative: Yuichi Matsuo(Aeronautical Technology Directorate, Numerical Simulation Research Unit)
- Contact Information: Yuya Ohmichi(ohmichi.yuya@jaxa.jp)
- Members: Gunpei Morikami
- Subject Category: Basic Research(Numerical analysis,Modeling)
Abstract
In this study, coherent structures around a reentry capsule were investigated using the unsteady flow solver FaSTAR. The flow field around a reentry capsule is important because the dynamic instability occurs especially insubsonic cruise. We studied the dynamic instability by numerically simulating the unsteady flow fields around the reentry capsule.
Goal
To clarify unsteady flow phenomena around a reentry capsule
Objective
To clarify coherent structures that cause dynamic instability
References and Links
N/A
Use of the Supercomputer
Numerical simulation of unsteady flow fields
Necessity of the Supercomputer
Expensive computational cost.
Achievements of the Year
It was found that ring vortex structures appeared in the wake of the reentry capsule. The temporal coefficients corresponding to these spatial structures also suggest that these large coherent structures oscillate relatively periodically.
Fig.1:Instantaneous flow field. Isosurfaces of the Q value, colored with freestream direction component of vorticity.
Fig.2:Frequency spectrum of CL
Publications
Presentations
1) Morikami, G., Ohmich, Y., Ishiko, K. and Kanazaki, M., 'Numerical Study of Coherent Structures Around a Reentry Capsule using Proper Orthogonal Decomposition,' AIAA SciTech 2017, 2017, 2017-0949.
Computational Information
- Parallelization Methods: Process Parallelization
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: n/a
- Number of Processes: 512
- Number of Threads per Process: 1
- Number of Nodes Used: 16
- Elapsed Time per Case (Hours): 10
- Number of Cases: 10
Resources Used
Total Amount of Virtual Cost(Yen): 8,755,379
Breakdown List by Resources
| System Name | Amount of Core Time(core x hours) | Virtual Cost(Yen) |
|---|---|---|
| SORA-MA | 4,970,245.96 | 8,142,520 |
| SORA-PP | 3,072.40 | 26,232 |
| SORA-LM | 10,209.69 | 229,718 |
| SORA-TPP | 0.00 | 0 |
| File System Name | Storage assigned(GiB) | Virtual Cost(Yen) |
|---|---|---|
| /home | 238.42 | 2,249 |
| /data | 36,621.11 | 345,448 |
| /ltmp | 976.56 | 9,211 |
| Archiving System Name | Storage used(TiB) | Virtual Cost(Yen) |
|---|---|---|
| J-SPACE | 0.00 | 0 |
Note: Virtual Cost=amount of cost, using the unit price list of JAXA Facility Utilization program(2016)
JAXA Supercomputer System Annual Report April 2016-March 2017