Research of Lattice Boltzmann Method
JAXA Supercomputer System Annual Report April 2019-March 2020
Report Number: R19ETET17
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, Senju Fujii
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 addition, the source code of implemented Cumulant LBM is tuned aimed for fast computation.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
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. In addition, due to the code tuning by writting down matrix calclation and SIMD, multiple relaxation model such as Cascaded LBM and Cumulant LBM can compute at 1.7 times the cost of SRT model.
Publications
– Non peer-reviewed papers
1) Takashi Ishida, Daichi Asaoka, Masaharu Kameda, Unsteady flow simulation around an airfoil with low-speed and high angle-of-attack conditions by Lattice Boltzmann Method, 33th CFD Symposium
Usage of JSS2
Computational Information
- Process Parallelization Methods: N/A
- Thread Parallelization Methods: OpenMP
- Number of Processes: 1
- Elapsed Time per Case: 1000 Second(s)
Resources Used
Fraction of Usage in Total Resources*1(%): 1.28
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 | 11,348,171.01 | 1.38 |
SORA-PP | 15,318.40 | 0.10 |
SORA-LM | 0.00 | 0.00 |
SORA-TPP | 0.00 | 0.00 |
File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
---|---|---|
/home | 495.91 | 0.41 |
/data | 49,018.88 | 0.84 |
/ltmp | 5,859.38 | 0.50 |
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 2019-March 2020