Launch Cost Reduction by Reusing Launch Vehicles
JAXA Supercomputer System Annual Report April 2017-March 2018
Report Number: R17EG3106
Subject Category: Research and Development
- Responsible Representative: Koichi Okita, Research Unit IV, Research and Development Directorate
- Contact Information: Yoshiki Takama takama.yoshiki@jaxa.jp
- Members: Yoshiki Takama, Yoshihisa Aoki
Abstract
This research conducts the study of key technologies applied to future reusable launch vehicles including long-life rocket engines, lightweight structures, landing guidance, and small experimental vehicles to validate the technologies.
Reference URL
N/A
Reasons for using JSS2
JSS2 is nessesary for the estimation of aerodynamic performance for a small experimental vehicle.
Achievements of the Year
CFD in the rocket launch phase was conducted as follows:
1) the inside of the rocket nozzle was not calculated.
2) the static pressure, static temperature, and velocity at the nozzle exit were given as the boundary condition.
The calculation started from the first-order accuracy with the pressure at the nozzle exit one third of the nominal value. The calculation was gradually accelerated, and successfully converged at the second-order accuracy with the pressure of the nozzle exit the nominal value.
The axial velocity distribution in the vicinity of the nozzle exit is shown in (Fig. 1). Mach number is 0.1. The angle of attack is 0 deg.
Fig.1: Axial velocity distribution at the lift-off (M=0.1, AOA=0deg)
Publications
N/A
Usage of JSS2
Computational Information
- Process Parallelization Methods: MPI
- Thread Parallelization Methods: N/A
- Number of Processes: 96
- Elapsed Time per Case: 300.00 hours
Resources Used
Fraction of Usage in Total Resources*1(%): 0.23
Details
Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.
| System Name | Amount of Core Time(core x hours) | Fraction of Usage*2(%) |
|---|---|---|
| SORA-MA | 1,895,520.26 | 0.25 |
| SORA-PP | 113.88 | 0.00 |
| SORA-LM | 0.00 | 0.00 |
| SORA-TPP | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 037.71 | 0.03 |
| /data | 889.02 | 0.02 |
| /ltmp | 634.77 | 0.05 |
| 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.
JAXA Supercomputer System Annual Report April 2017-March 2018