Aerodynamics of Re-entry Vehicle System with Inflatable Ballute

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EACA57

Subject Category: JSS Inter-University Research

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

Abstract

We will investigate the aerodynamic characteristics of a flying vehicle equipped with a deployable parachute. In particular, we will use fluid-structure interaction analysis to examine the effect of parachute deformation on aerodynamic performance.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

In fluid-structure interaction analysis, because it is necessary to perform the analysis by coupling the fluid analysis, the structural analysis, and the deformation of the analysis mesh associated with the structural analysis, the computational cost is significantly higher than that of a standard fluid analysis.

Achievements of the Year

For this year's analysis, we used SU2, a software package capable of performing fluid dynamics and structural analyses, as well as mesh deformation associated with structural analysis, all within a single programme. This analysis clarified the behaviour of shock wave interactions between the re-entry vehicle and the ballute within the supersonic range. It also revealed that altering the Young's modulus of the ballute significantly affects the degree of deformation, thereby causing the drag coefficient to change. Furthermore, the SU2 executable file, which was compiled for Intel CPUs, could be used directly for MPI parallel computing via JSS3.

Fig.1: Pressure coefficient distribution around the reentry capsule with deformed ballute (left: Young's modulus 4.0 MPa, right: 2.0 MPa)

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: 60 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	0.00	0.00
TOKI-ST	96.73	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	0.00	0.00
/data and /data2	0.00	0.00
/ssd	0.00	0.00

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.