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Research of Lattice Boltzmann Method

JAXA Supercomputer System Annual Report April 2017-March 2018

Report Number: R17ETET17

Subject Category: Skills Acquisition System

PDF available here

  • 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.

Annual Reoprt Figures for 2017

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.

Computational Resources
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 Resources
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 Resources
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