Basic research for system integration of silent supersonic airplane technologies
JAXA Supercomputer System Annual Report April 2020-March 2021
Report Number: R20ETET01
Subject Category: Skills Acquisition System
- Responsible Representative: Yoshikazu Makino, Aeronautical Technology Directorate, Aviation Systems Research Unit
- Contact Information: Hiroaki Ishikawa(ishikawa.hiroaki2@jaxa.jp)
- Members: Ryo Shimada, Toshiya Yokoi, Hiroaki Ishikawa, Masahiro Doi
Abstract
The system integration design technologies for achieving low sonic-boom, low aerodynamic drag, low landing and take-off noise, and light weight simultaneously are the key technologies for future supersonic airplanes. JAXA is promoting the R&D for these technologies based on our experiences of demonstrating the advanced low-drag and low-boom design concepts.
Reference URL
Please refer to http://www.aero.jaxa.jp/eng/research/frontier/sst/ .
Reasons and benefits of using JAXA Supercomputer System
To achieve low sonic-boom, low aerodynamic drag, low landing and take-off noise, and light weight simultaneously, the multi-objective optimization tools are utilized in the design study. The super computer is necessary to obtain the multiple objective function efficiently with many numerical simulations.
Achievements of the Year
Buzz, the biggest issue in the operation of inlets for supersonic aircraft, is caused by the inflow of shear layers generated in the external compression region of the inlet. In order to prevent unsteady pressure fluctuation caused by buzz, it is necessary to clarify the mechanism of buzz generation. In this study, the process from the inflow of shear layer to the onset of buzz was investigated in detail by using FaSTAR (Fig. 1). As a result, it was found that the buzz occurs when the vortex generated by the shear layer inflow significantly restricts the flow rate into the intake (Fig. 2).
Fig.1: Flow field
Fig.2: Pressure time history
Publications
N/A
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: Automatic Parallelization
- Number of Processes: 128
- Elapsed Time per Case: 5.3 Hour(s)
Resources Used(JSS2)
Fraction of Usage in Total Resources*1(%): 0.66
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 | 3,012,904.94 | 0.57 |
| SORA-PP | 88,001.71 | 0.69 |
| SORA-LM | 4,661.88 | 2.74 |
| SORA-TPP | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 1,148.81 | 1.05 |
| /data | 47,673.49 | 0.92 |
| /ltmp | 10,695.69 | 0.91 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 3.41 | 0.11 |
*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.
Resources Used(JSS3)
Fraction of Usage in Total Resources*1(%): 0.05
Details
Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.
| System Name | Amount of Core Time(core x hours) | Fraction of Usage*2(%) |
|---|---|---|
| TOKI-SORA | 8.00 | 0.00 |
| TOKI-RURI | 7,282.04 | 0.04 |
| TOKI-TRURI | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 940.96 | 0.64 |
| /data | 56,271.58 | 0.94 |
| /ssd | 413.26 | 0.22 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 3.41 | 0.11 |
*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 2020-March 2021