Research of Lattice Boltzmann Method
JAXA Supercomputer System Annual Report April 2018-March 2019
Report Number: R18ETET17
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: Daichi Asaoka
Abstract
The research objective is to implement Cumulant LBM for collision operator and validate it in terms of the solution accuracy, stability, and cost for high-Reynolds number flow. In order to compare with SRT and Cascaded LBM, numerical simulation of 2-dimensional shear layer was carried out. It is found the Cumulant LBM resolved the phenomenon better than Cascaded LBM. On the other hand, the computational cost of Cumulant LBM, w/o any tuning, was 1.2 times higher than Cascaded LBM.
Reference URL
N/A
Reasons for using JSS2
The computational cost of unsteady flow simulation by LBM is very high.
We use JSS2 to reduce the computational time by paralleization.
Achievements of the Year
Cumulant LBM was implemented to current our code and validated through the comparison with SRT and Cascaded LBM in terms of solution accuracy, stability, and cost.
Fig.1: location where vortex profile is aquired
Fig.2: profile of primary vortex
Fig.3: profile of primary vortex (enlarge view at vortex peak)
Publications
N/A
Usage of JSS2
Computational Information
- Process Parallelization Methods: N/A
- Thread Parallelization Methods: OpenMP
- Number of Processes: 1
- Elapsed Time per Case: 180 Second(s)
Resources Used
Fraction of Usage in Total Resources*1(%): 0.04
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 | 2,876.69 | 0.00 |
| SORA-PP | 6,295.98 | 0.05 |
| SORA-LM | 0.00 | 0.00 |
| SORA-TPP | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 486.37 | 0.50 |
| /data | 48,923.51 | 0.86 |
| /ltmp | 3,906.25 | 0.33 |
| Archiver Name | Storage Used(TiB) | Fraction of Usage*2(%) |
|---|---|---|
| J-SPACE | 0.00 | 0.00 |
*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