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Aerodynamic testing technology for reentering capsules

JAXA Supercomputer System Annual Report February 2021-January 2022

Report Number: R21EA1403

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Shigeru Hamamoto, Aviation Technology Directorate, Aeronautical Facility Research Unit
  • Contact Information: Keisuke Fujii(keisuke@chofu.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

Flow inside JAXA 1.27m hypersonic wind tunnel was solved numerically. The causes for the variation of dynamic pressure at the nozzle exit, which was observed in the experiments, were investigated numerically. Two factors were predicted as a candidate of the cause. One is the wall temperature upsream of the cooled nozzle throat block, as shown in Fig.1. The other is the inflow from the downstream of the settling chamber, as shown in Fig.2. The magnitude of the dynamic pressure variation was comparable between experiment and CFD.

Annual Reoprt Figures for 2021

Fig.1: The effect of non-cooled block temperature on the dynamic pressure at the nozzle exit

 

Annual Reoprt Figures for 2021

Fig.2: The effect of the inflow from the gap on the dynamic pressure at the nozzle exit

 

Publications

N/A

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 48 – 144
  • Elapsed Time per Case: 24 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.08

 

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 1799921.68 0.09
TOKI-ST 10632.36 0.01
TOKI-GP 0.00 0.00
TOKI-XM 0.00 0.00
TOKI-LM 18.72 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 137.91 0.14
/data and /data2 3589.32 0.04
/ssd 128.33 0.03

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 5.82 0.04

*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)
646.36 0.45

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

JAXA Supercomputer System Annual Report February 2021-January 2022