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Aerodynamics of Re-entry Vehicle System with Inflatable Ballute

JAXA Supercomputer System Annual Report February 2022-January 2023

Report Number: R22EACA57

Subject Category: JSS Inter-University Research

PDF available here

  • Responsible Representative: Hirotaka Otsu, Professor, Ryukoku University
  • Contact Information: Hirotaka Otsu, Professor, Ryukoku University(otsu@rins.ryukoku.ac.jp)
  • Members: Shinichiro Mekata, Hirotaka Otsu

Abstract

To determine the aerodynamic characteristics of a flight vehicle equipped with an inflatable ballute. In particular, the influence of the deformation of the ballute on the aerodynamic characteristics will be investigated.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

There have been many shapes depending on the deformation of ballute with various flight conditions such as Mach number and the tilt angle.

Achievements of the Year

In this year’s analysis, the effects of the deformation of the ballute on the pressure distribution and flow field were investigated. The deformation of the ballute was measured in a wind tunnel experiment, and the deformed shape was created using OpenSCAD, a software program that can create shapes using mathematical formulas. The grid required for the analysis was created using HexaGrid v1.1, and the analysis was performed using FaSTAR. Figure 1 shows the pressure distribution on the ballute surface. The results show that when the deformation is small, the pressure distribution on the ballute surface is almost uniform, whereas when the deformation is large, the pressure distribution changes significantly depending on the surface deformation. It was also confirmed that when shock wave interference occurs, a local pressure increase occurs.

Annual Reoprt Figures for 2022

Fig.1: Comparison of surface pressure by the deformation of the ballute

 

Publications

N/A

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 64
  • Elapsed Time per Case: 30 Minute(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 77.33 0.00
TOKI-ST 61.11 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 15.00 0.01
/data and /data2 150.00 0.00
/ssd 150.00 0.02

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 0.00 0.00

*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)
0.00 0.00

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

JAXA Supercomputer System Annual Report February 2022-January 2023