Research on three-dimensional cavity flow
JAXA Supercomputer System Annual Report February 2021-January 2022
Report Number: R21ECWU12
Subject Category: Cooperative Graduate School System
- Responsible Representative: Yuya ohmichi, Aeronautical Technology Directorate,Numerical Simulation Research Unit
- Contact Information: Yuya ohmichi (ohmichi.yuya@jaxa.jp)
- Members: Miumi Maezawa, Yuya Ohmichi
Abstract
It is well known that rectangular-shaped cavities, such as those found in aircraft landing gear storage areas, can cause noise due to self-excited oscillation caused by an unsteady fluid phenomenon. In this study, the phenomenon of self-excited oscillation inside cavities was investigated by numerical fluid simulations
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
Numerical simulation of unsteady flow fields is computationally expensive
Achievements of the Year
The spatio-temporal structure of the cavity flow with a Mach number of 1.4 is visualized as shown in Figures 1 and 2 using dynamic mode decomposition. The visualization results show that the sidewalls change the spanwise velocity structure. It is also suggested that the sidewalls affect the pressure fluctuations that cause aerodynamic noise.
Fig.1: Spatial structure of spanwise velocity without sidewalls (St=0.1)
Fig.2: Spatial structure of spanwise velocity with sidewalls (St=0.1)
Publications
N/A
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: OpenMP
- Number of Processes: 256
- Elapsed Time per Case: 50 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 0.11
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 | 2091789.19 | 0.10 |
| TOKI-ST | 85995.40 | 0.11 |
| TOKI-GP | 0.00 | 0.00 |
| TOKI-XM | 0.00 | 0.00 |
| TOKI-LM | 13463.57 | 1.00 |
| 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 | 600.00 | 0.60 |
| /data and /data2 | 102048.00 | 1.09 |
| /ssd | 5140.00 | 1.33 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 6.32 | 0.04 |
*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) | 2028.79 | 1.42 |
*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.
JAXA Supercomputer System Annual Report February 2021-January 2022