Large-scale analysis of multi-droplet evaporation by interface-resolved DNS
JAXA Supercomputer System Annual Report April 2020-March 2021
Report Number: R20EFHC0302
Subject Category: Common Business
- Responsible Representative: Naoyuki Fujita, Manager, JAXA, Security and Information Systems Department, Supercomputer Division
- Contact Information: Taisuke Nambu, JAXA, Aeronautical Technology Directorate, Numerial Simulation Research Unit(nambu.taisuke@jaxa.jp)
- Members: Taisuke Nambu, Yasuhiro Mizobuchi
Abstract
In order to improve the accuracy of the spray model for analyses of an aircraft engine combustor, detailed analyses of fuel droplet group evaporation was conducted using a two-phase flow analysis solver with an evaporation model.
Reference URL
N/A
Reasons and benefits of using JAXA Supercomputer System
This analysis was conducted in JSS3 large-scale analysis challenge. The occupation usage of the large computational resources made it possible to carry out the analysis involving a large number of droplets.
Achievements of the Year
Droplet group evaporation analyses were conducted in two-types situations where there were 640 droplets with a diameter of 0.5 mm and 2963 droplets with a diameter of 0.3 mm.
We succeeded to obtain data as follows;
1.Variation of the whole evaporation rate by the difference in droplet diameter
2.Variation of the temperature History by the difference in droplet location
3.Variation of the evaporation rate of each droplet by the difference in distance between Droplets.
Fig.1: Time variations of the temperature distribution on the liquid-gas interface and the iso-surface of the fuel component.
Fig.2(video): Time variations of the temperature distribution on the liquid-gas interface and the iso-surface of the fuel component (movie).
Publications
N/A
Usage of JSS
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: N/A
- Number of Processes: 66944
- Elapsed Time per Case: 240 Hour(s)
Resources Used(JSS2)
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 | 0.00 | 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 | 11.96 | 0.01 |
| /data | 2,480.16 | 0.05 |
| /ltmp | 496.03 | 0.04 |
| 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.
Resources Used(JSS3)
Fraction of Usage in Total Resources*1(%): 8.54
Details
Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.
| System Name | Amount of Core Time(core x hours) | Fraction of Usage*2(%) |
|---|---|---|
| TOKI-SORA | 47,053,305.01 | 10.12 |
| TOKI-RURI | 1,089.17 | 0.01 |
| TOKI-TRURI | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 54.89 | 0.04 |
| /data | 8,463.55 | 0.14 |
| /ssd | 561.61 | 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 2020-March 2021