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Study on dynamic instability of a reentry capsule at transonic speed

JAXA Supercomputer System Annual Report April 2019-March 2020

Report Number: R19ETET12

Subject Category: Skills Acquisition System

PDF available here

  • Responsible Representative: Takashi Aoyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
  • Contact Information: Aeronautical Technology Directorate, Numerical Simulation Research Unit(ohmichi.yuya@jaxa.jp)
  • Members: Masato Harafuji

Abstract

It is suggested that fluid phenomena of specific frequency may affect the dynamic instability of atmospheric entry capsules. In this study, numerical fluid calculation was carried out for the blunt body shape, and the wake structure was investigated using dynamic mode decomposition.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Large cost is required to simulate unsteady flow fields.

Achievements of the Year

Unsteady fluid simulation around a blunt body at subsonic speeds and pattern extraction by dynamic mode decomposition were carried out.

Publications

N/A

Usage of JSS2

Computational Information

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

Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.04

 

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 104,346.82 0.01
SORA-PP 24,899.36 0.16
SORA-LM 1,428.87 0.60
SORA-TPP 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 238.42 0.20
/data 42,480.49 0.73
/ltmp 976.56 0.08

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 17.33 0.44

*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