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Numerical study on unsteady flow fields around a re-entry capsule

JAXA Supercomputer System Annual Report April 2017-March 2018

Report Number: R17ETET12

Subject Category: Skills Acquisition System

PDF available here

  • Responsible Representative: Takashi Takahashi, Aeronautical Technology Directorate, Numerical Simulation Research Unit
  • Contact Information: Kenji Kobayashi knjkoba@chofu.jaxa.jp
  • Members: Kenji Kobayashi

Abstract

Coherent structures around a re-entry capsule were investigated using the unsteady flow solver FaSTAR. A re-entry capsule shows dynamic instability in subsonic and transonic speeds. This study focused on the subsonic unsteady flow around the capsule and investigated the mechanism of the dynamic instability.

Reference URL

N/A

Reasons for using JSS2

Large computational cost is required to simulate the unsteady flow field.

Achievements of the Year

Coherent structures around a reentry capsule at M=0.4 and 0.8 were simulated. It reproduced the fluid phenomena which had frequency of St ~ 0.01 , where St is the Strouhal number. We found this frequency was close to the frequency of the dynamic instability of the capsule.

Annual Reoprt Figures for 2017

Fig.1: Instantaneous flow field of M = 0.4 (Iso-surface of Q-criterion))

 

Annual Reoprt Figures for 2017

Fig.2: Frequency distribution of lift coefficient

 

Publications

N/A

Usage of JSS2

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 512
  • Elapsed Time per Case: 700.00 hours

Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.13

 

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 533,290.78 0.07
SORA-PP 14,231.82 0.18
SORA-LM 17,487.62 9.01
SORA-TPP 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 238.42 0.17
/data 42,480.49 0.79
/ltmp 976.56 0.07

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 5.80 0.25

*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 2017-March 2018


ここは、サイドバー・エリアの先頭です。

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Language / 言語

"Annual Report" available

How to use JSS3

To use JSS3, please refer to "How to use JSS3" page .

Location

Chofu Aerospace Center
7-44-1 Jindaiji Higashi-machi, Chofu-shi, Tokyo