Research on Particle Simulation Methods

JAXA Supercomputer System Annual Report February 2023-January 2024

Report Number: R23EDA201G19

Subject Category: Aeronautical Technology

Responsible Representative: Yasuhiro Mizobuchi, Aviation Technology Directorate, Aircraft Lifecycle Innovation Hub
Contact Information: Kenichi Kubota(kubota.kenichi@jaxa.jp)
Members: Kenichi Kubota, Keita Nakamoto, Hiroki Tsujimura

Abstract

The purpose of this research is to obtain the simulation technology of particle simulation, known to be useful for analysing multi-physics phenomena, to accelerate aircraft development.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

JSS3 was used to conduct the simulaiton of liquid with a particle method, which needs the resource of JSS3 to deal with tens of millions particles in a large computational domain.

Achievements of the Year

We analyzed the water spray from aircraft tires on an actual scale using the particle method. The airflow around the actual aircraft was analyzed in advance, and based on the airflow information, the water spray generated from the nose gear was simulated. The simulation results were compared with the actual test, and it was confirmed that the angle between the water film and the runway was consistent with the test result.On the other hand, it was also found that there was a slight difference between the simulation and the test results on the water distribution bounced forward, suggesting the need for higher particle resolution.

Publications

[1]K. Kubota, S. Koga, Y. Iijima, S. Koike, K. Nakakita: Research on Advancement of Prediction Technology for Water Spray from Aircraft Tire, 41st Aerospace Numerical Simulation Symposium, 3D04, 2023.

[2]K. Kubota: Research and Development for Predicting Water Spray Generated from Aircraft Tires, Prometech Simulation Conference 2023.

[3] H. Tsujimura, K. Kubota: Modeling wettability effect in the surface-tension-as-pressure model for particle methods, 37th CFD Symposium, 2410-13-04, 2023.

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 80 – 256
Elapsed Time per Case: 168 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 1.20

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name	CPU Resources Used (Core x Hours)	Fraction of Usage*2(%)
TOKI-SORA	32384652.80	1.46
TOKI-ST	38974.60	0.04
TOKI-GP	0.00	0.00
TOKI-XM	0.02	0.00
TOKI-LM	605.51	0.05
TOKI-TST	0.00	0.00
TOKI-TGP	0.00	0.00
TOKI-TLM	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	248.71	0.21
/data and /data2	7255.43	0.04
/ssd	0.00	0.00

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.

ISV Software Licenses Used

ISV Software Licenses Resources
	ISV Software Licenses Used (Hours)	Fraction of Usage*2(%)
ISV Software Licenses (Total)	17.05	0.01

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.