JAXA Supercomputer System Annual Report April 2018-March 2019

Report Number: R18EA1403

Subject Category: Aeronautical Technology

PDF available here

• Responsible Representative: Shigeru Hamamoto, Aeronautical Technology Directorate, Aerodynamics Research Unit
• Contact Information: Hajime Miki(miki.hajime@jaxa.jp)
• Members: Hajime Miki, Yoshiki Takama

Abstract

In some cases, a lifting reentry capsule does not have enough attitude control ability. The purpose of this study is to utilize RCS interaction as an auxillary control force by local modification of capsule’s external shape.

Reference URL

N/A

Reasons for using JSS2

The use of JSS2 was necessary for performing a lot of CFD simulations in which external shape of capsule and strength of RCS jet were varied.

Achievements of the Year

CFD analysises using FaSTAR code were performed on a capsule which has a bulge around its RCS nozzle. The simulation results were compared with experimental data aquired from a hypersonic wind tunnel test, and it showed good agreement in terms of both interaction force and heating rate (Fig.1). In addiition, the validated CFD technique was used for investigating a smaller bulge shape which is applicable to a real capsule, and it supported a design process of a improved wind tunnel model.

Fig.1: CFD results on a reentry capsule with a bulge

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: 20 Hour(s)

Resources Used

Fraction of Usage in Total Resources*1(%): 0.11

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

*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 2018-March 2019