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Aerodynamic testing technology for reentering capsules

JAXA Supercomputer System Annual Report April 2019-March 2020

Report Number: R19EA1403

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Shigeru Hamamoto, Unit director, Aeronautical Technology Directorate, Aerodynamics Research Unit
  • Contact Information: Keisuke Fujii(keisuke@chofu.jaxa.jp)
  • Members: Hajime Miki, Yoshiki Takama, Keisuke Fujii, Takahiro Yamamoto

Abstract

To enhance hypersonic aerodynamic testing technology especially for reentering vehicles through developing understanding about the hypersonic wind tunnel nozzle flow which affects a lot estimation error to the flight characteristics and through defining the ability in predicting RCS jet interaction.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Since it perfectly suits the requirement in calculating heavy RCS jet interaction flow field and the hypersonic nozzle flow. Useful tools such as Fastar is another.

Achievements of the Year

JAXA1.27m hypersonic wind tunnel was numerically solved. The numerical result of p02/p0 at the nozzle exit was compared with the experimental data (p0:reservoir pressure, p02:pitot pressure). As shown in Figs.1 and 2., the quatitative tendency was successfully observed.

Also, predicting ability in the RCS jet interaction has been evaluated with the hypersonic wind tunnel tests.

Annual Reoprt Figures for 2019

Fig.1: Comparison of p02/p0 at the nozzle exit between experiment and calculation

 

Annual Reoprt Figures for 2019

Fig.2: Comparison of Mach number at the nozzle exit between experiment and calculation

 

Publications

N/A

Usage of JSS2

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 32 – 128
  • Elapsed Time per Case: 50 Hour(s)

Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.09

 

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 767,913.67 0.09
SORA-PP 283.26 0.00
SORA-LM 0.00 0.00
SORA-TPP 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 79.75 0.07
/data 3,050.09 0.05
/ltmp 2,525.11 0.21

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 2.70 0.07

*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 2019-March 2020