Research on three-dimensional buffet simulation
JAXA Supercomputer System Annual Report April 2018-March 2019
Report Number: R18ETET21
Subject Category: Skills Acquisition System
- Responsible Representative: Takashi Aoyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
- Contact Information: Takashi Ishida, Aeronautical Technology Directorate, Numerical Simulation Research Unit(ishida.takashi@jaxa.jp)
- Members: Yoimi Kojima, Yoichi Saito
Abstract
In this project, we conduct a research on Embedded Large Eddy Simulation (ELES), which is one of the approach to simulate unsteady flows, in order to predict and understand the three-dimensional buffet phenomenon.
Reference URL
N/A
Reasons for using JSS2
Unsteady flow simulations with ELES need relatively large computational grid compared to RANS simulations in order to develop artificially added distrubances in the flow field. JSS2 is used to accelerate the computational time.
Achievements of the Year
As a preliminary step of applyinf ELES to three-dimensional buffet phenomenon, validation was performed by applying ELES to low speed turbulent flow simulations. In the case of the turbulent boundary layer flow over flat plate, the result obtained by ELES could reproduced the log-low and showed good agreement with RANS result.
Fig.1: Computational setting of turbulent boundary layer
Fig.2: Iso-surfaces of the instantaneous Q-criterion
Fig.3: Cf distributions
Publications
N/A
Usage of JSS2
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: N/A
- Number of Processes: 256 – 1024
- Elapsed Time per Case: 40 Hour(s)
Resources Used
Fraction of Usage in Total Resources*1(%): 0.78
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 | 6,891,428.22 | 0.84 |
| SORA-PP | 15,718.19 | 0.13 |
| SORA-LM | 133.85 | 0.06 |
| SORA-TPP | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 104.90 | 0.11 |
| /data | 34,179.70 | 0.60 |
| /ltmp | 3,906.25 | 0.33 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 177.20 | 6.20 |
*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 2018-March 2019