System Operation of the Digital/Analog-Hybrid Wind Tunnel (DAHWIN)

JAXA Supercomputer System Annual Report April 2017-March 2018

Report Number: R17EA2405

Subject Category: Aeronautical Technology

Responsible Representative: Shigeru Kuchi-Ishi, Aeronautical Technology Directorate, Aerodynamics Research Unit
Contact Information: Shigeru Kuchi-Ishi shigeruk@chofu.jaxa.jp
Members: Hiroyuki Kato, Shigeru Kuchiishi, Makoto Ueno, Atsushi Hashimoto, Yuichi Matsuo, Kanako Yasue, Suzuki Kohji

Abstract

Through the operation of the JAXA Digital/Analog-Hybrid Wind Tunnel (DAHWIN), we aim to realize the complementary use of Experimental Fluid Dynamics (EFD) and Computational Fluid Dynamics (CFD). Specifically, a series of DAHWIN functions (e.g. CFD before wind tunnel testing, test preparation using pre-CFD data, real time EFD/CFD data monitoring, and EFD/CFD data integration) are served to the system users.

Reference URL

Please refer to ‘Digital/Analog-Hybrid Wind Tunnel (DAHWIN) | Aerodynamic technology | Aeronautical Technology Directorate‘.

Reasons for using JSS2

DAHWIN performs a number of high-fidelity and large-scaled computations (3D RANS analysis) based on the JAXA 2m x 2m transonic wind tunnel testing, and then the use of JSS2 is necessary.

Achievements of the Year

For the CFD analysis using DAHWIN, the system was applied to a total of two JAXA 2m x 2m transonic wind tunnel tests.

Fig.1: CFD results for the AGARD-B model using DAHWIN

Publications

N/A

Usage of JSS2

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 16 – 96
Elapsed Time per Case: 1.25 hours

Resources Used

Fraction of Usage in Total Resources*1(%): 0.02

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	5,099.41	0.00
SORA-PP	28.83	0.00
SORA-LM	56.49	0.03
SORA-TPP	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	649.68	0.45
/data	22,918.60	0.42
/ltmp	7,525.62	0.57

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	0.71	0.03

*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.