Research of Lattice Boltzmann Method
JAXA Supercomputer System Annual Report April 2017-March 2018
Report Number: R17ETET17
Subject Category: Skills Acquisition System
- Responsible Representative: Takashi Aoyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
- Contact Information: Takashi Ishida ishida.takashi@jaxa.jp
- Members: Toru Yamaya, Daichi Asaoka
Abstract
The purpose of this research is to construct a collision model considering the influence of bulk viscosity and verify the stability in high Reynolds number flow analysis. In order to compare the computational stability and calculation time using SRT (Single-Relaxation Time) w/o bulk viscosity, the calculation of 2-dimensional shear layer flow was carried out for the verification. It is found that SRT with bulk viscosity improves the stability and accuracy even at low grid-resolution.
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 cost by paralleization.
Achievements of the Year
By adding the influence of bulk viscosity to SRT, the computation stability and accuracy was improved even in the case of high Reynolds number flow and low grid-resolution.
Fig.1: 2-dimensional shear layer flow (Reynolds number 10,000)
Publications
■ Presentations
1)Toru Yamaya, "Performance evaluation of collision model on Lattice Boltzmann Method", Computational Fluid Dynamics symposium 2016, B06-1.
2)Toru Yamaya, "Numerical simulation of unsteady flows with LBM and statistics comparison of flow fields", Computational Fluid Dynamics symposium 2017, D08-1.
Usage of JSS2
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: OpenMP
- Number of Processes: 2
- Elapsed Time per Case: 90.00 seconds
Resources Used
Fraction of Usage in Total Resources*1(%): 0.34
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 | 2,528,479.04 | 0.34 |
| SORA-PP | 0.00 | 0.00 |
| 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 | 0.34 |
| /data | 48,923.51 | 0.90 |
| /ltmp | 3,906.25 | 0.29 |
| 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 2017-March 2018