Development of a Many-block Method for Enabling an Extremely Fast Combustion LES
JAXA Supercomputer System Annual Report April 2018-March 2019
Report Number: R18EDA201N13
Subject Category: Aeronautical Technology
- Responsible Representative: Shingo Matsuyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
- Contact Information: Shingo Matsuyama(smatsu@chofu.jaxa.jp)
- Members: Shingo Matsuyama
Abstract
In this research, by the following two approaches: (1) acceleration of time integration by implicit time integration method and (2) acceleration of calculation using an accelerator, we try to achieve a speedup of more than 100 times compared with the current level of CFD runs. We aim to develop a "many-block method" that can complete a single case of turbulent combustion LES in an extremely short time period.
Reference URL
N/A
Reasons for using JSS2
We used JSS2 for developing a LES code by a "many-block method" that has inner cells for high-order interpolation inside an unstructured cell, and for performing LES analysis with 100 million grid points.
Achievements of the Year
In this research, we developed a LES code by "many-block method" that has inner cells for high-order interpolation inside an unstructured cell. We performed an LES analysis for a cylinder at Re = 3900 with about 63 million unstrectured hexa-cells (Figs.1 and 2).
Fig.1: Example of unstructured hexa-cells around a cylinder. A single hexa-cell has 5x5x5 subcells in its inside. Cited from non peer-reviewed paper [2].
Fig.2: Instantaneous contours of vorticity magnitude on the x-y plane for the LES around a cylinder at Re = 3900. Cited from non peer-reviewed paper [2].
Publications
- Non peer-reviewed papers
1) Shingo Matsuyama, "High-order Unstructured-grid Large Eddy Simulation Using Many-block Method", Proceedings of the 50th Fluid Dynamics Conference /
the 36th Aerospace Numerical Simulation Symposium, 3E02, 2018.
2) Shingo Matsuyama, "Unstructured-grid LES Using Many-block Method", Proceedings of the 32nd CFD Sympoium, C08-3, 2018.
- Oral Presentations
1) Shingo Matsuyama, "High-order Unstructured-grid Large Eddy Simulation Using Many-block Method", the 50th Fluid Dynamics Conference /
the 36th Aerospace Numerical Simulation Symposium, 2018.
2) Shingo Matsuyama, "Unstructured-grid LES Using Many-block Method", the 32nd CFD Sympoium, 2018.
Usage of JSS2
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: OpenMP
- Number of Processes: 64 - 256
- Elapsed Time per Case: 48 Hour(s)
Resources Used
Fraction of Usage in Total Resources*1(%): 0.00
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 | 5,106.17 | 0.00 |
| 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 | 399.29 | 0.41 |
| /data | 1,899.35 | 0.03 |
| /ltmp | 325.52 | 0.03 |
| 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