JAXA Supercomputer System Annual Report April 2020-March 2021

Report Number: R20EDA201N03

Subject Category: Aeronautical Technology

PDF available here

• Responsible Representative: Takashi Aoyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
• Contact Information: Takashi Takahashi(takahashi.takashi@jaxa.jp)
• Members: Kan Ohkubo, Yuya Ohmichi, Takashi Takahashi, Masashi Kanamori, Kento Yamada, Tomoaki Ikeda, Keita Nakamoto, Kenichi Kubota, Hiroki Tsujimura, Atsuya Suzuki

Abstract

The purpose of this research is to obtain the simulaiton technology to analyze phenomana relating with multi-physics such as acoustic fluid dynamics and multi-phase flows.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

JSS2 was used to conduct the simulaiton of liquid with a particle method, which needs the resource of JSS2 to deal with tens of millions particles in a large computational domain.

Achievements of the Year

Water spray generated from a tire of an aircraft running on flooded runway was simulated using explicit MPS method. By considering aerodynamic force evaluated with a model developed in last year, it was found that the distribution of the water spray got close to the experimental data. Also, the jet break up problem was simulated as validation of the aerodynamic model, and methodology of coupling simulation between P-Flow and FaSTAR was investigated.

Publications

- Oral Presentations

1)S. Koga, K. Kubota, Y. Iijima, S. Koike, K. Nakakita: Quasi-Full-Scale Test for Prediction Technology of Water Spray Generated by Aircraft Tire, Proceedings of the Fluid Dynamics Conference/Aerospace Numerical Simulation Symposium 2020 Online, 2A05, 2020.

2)H. Tsujimura, K. Kubota, T. Sato: Numerical Analysis of Water Spray from Firefighting Aircraft Using Grid and Particle Methods Coupled by the Aerodynamic Force Model, Proceedings of the Fluid Dynamics Conference/Aerospace Numerical Simulation Symposium 2020 Online, 2A06, 2020.

3)M. Orsztynowicz, H. Amano, K. Kubota, T. Miyajima: Exploiting temporal parallelism in particle-based incompressive fluid simulation on FPGA, CANDAR2020, 102, 2020.

4) T. Takahashi, H. Ura, K. Okubo, T. Tsuchiya: Numerical Analysis and Measurement Techniques for Aircraft Cabin Noise Using JAXA's Jet-FTB "HISHO", Proceedings of the Fluid Dynamics Conferene/Aerospace Numerical Simulation Symposium 2020 Online, 2A07, 2020.

5) T. Ikeda: Accuracy Verification for the Inhomogeneous Wave Equation Discretized by a Finite Difference Scheme on Homogeneous Cartesian Grid, Proceedings of the Fluid Dynamics Conferene/Aerospace Numerical Simulation Symposium 2020 Online, 1A06, 2020.

Usage of JSS

Computational Information

• Process Parallelization Methods: MPI
• Thread Parallelization Methods: N/A
• Number of Processes: 80 - 144
• Elapsed Time per Case: 10 Hour(s)

Resources Used(JSS2)

Fraction of Usage in Total Resources*1(%): 0.93

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

*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(%): 0.36

Details

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

*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