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Aerodynamic testing technology for reentering capsules

JAXA Supercomputer System Annual Report February 2023-January 2024

Report Number: R23EA1403

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Shigeru Hamamoto, Aviation Technology Directorate, Aeronautical Facility Research Unit
  • Contact Information: Keisuke Fujii(fujii.keisuke@jaxa.jp)
  • Members: Keisuke Fujii, Hiroya Toriida, Hidemi Takahashi, Yoshiki Takama, 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

From the CFD results in the last fiscal year, the candidate cause for the dynamic pressure variation (2%) at the nozzle exit observed at JAXA 1.27m hypersonic wind tunnel was 300-700K of the uncooled block temperature, or 0.7-1.4mm of the gap with 300 K of the inflow temperature. The temperature of the uncooled block started to be measured by the radiation thermometer at this fiscal year. At the present stage, the uncooled block temperature was not the main reason for the variation of the dynamic pressure at the nozzle exit as shown in Fig. 1. The number of the experimental data was small, and more data are necessary for the conclusion.

Annual Reoprt Figures for 2023

Fig.1: The effect of uncooled block temperature on change rate of the freestream dynamic pressure

 

Publications

N/A

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 48
  • Elapsed Time per Case: 40 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.00

 

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 5779.75 0.00
TOKI-ST 1.64 0.00
TOKI-GP 0.00 0.00
TOKI-XM 0.00 0.00
TOKI-LM 0.00 0.00
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 232.67 0.19
/data and /data2 2795.42 0.02
/ssd 308.00 0.03

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 4.21 0.02

*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)
10.64 0.00

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

JAXA Supercomputer System Annual Report February 2023-January 2024