JAXA Supercomputer System Annual Report April 2016-March 2017

Report Number: R16E0057

• Responsible Representative: Toshiharu Mizukaki(Tokai University)
• Contact Information: Toshiharu Mizukaki(mizukaki@keyaki.cc.u-tokai.ac.jp)
• Members: Toshiharu Mizukaki, Taroh Odagiri, Yusuke Higo, Susumu Tanaka, Takayoshi Kubota, Akari Kato, Shouta Natori
• Subject Category: Basic Research(Numerical analysis)

Abstract

Around the supersonic parachute for Mars probing, drastic transformation of shock-wave oscillation has been observed. In the worst case, the shock waves oscillation deforms the parachute to collapse. In this research, we try to revile the mechanism of transformation of the shock waves and develop the design methodology for oscillation-free parachute. At the first step of this research, simplified model of the supersonic parachute is investigated to compare to experimental result.

Goal

Shock wave oscillation around a forward-facing concave is the fundamental and well-known phenomena such as BUZZ aroundsupersonic intake. The objective of this research is to verify experimental result and develop the prediction technique on the self-sustained shock wave oscillation.

Objective

The goal of this research is to contribute for developing the supersonic parachute for planetary probing that can suppress large deformation of the shock waves around it.

References and Links

N/A

Use of the Supercomputer

To use the fluid analysis code, FaSTAR, that has been developed JAXA, it is best way to run the code on JSS2 for our computational environment.

Necessity of the Supercomputer

For effective analysis by using FaSTAR, JSS2 must provide best envelopment to run it. Moreover, full 3-dimensional analysis will be needed to carry out our fluid analysis. It must consume huge space of memory which PC is not able to provide.

Achievements of the Year

We do not have any results by using JSS2 because we started learning this JSS2 system from Oct. 2016. Therefore, we learned how to use JSS2 with our home-made code which is not optimized for parallel processing.

We will carry out three dimensional analysis with FaSTAR on unstable oscillation of shock waves around a forward-facing cavity. The numerical analysis consists of a fundamental research on aerodynamics of supersonic parachute which is used for deceleration device for planetary probe. We expect that the numerical result would help us to understand the attitude of shock waves affected by acoustic disturbances.

Fig.1:Shock waves oscillation around a forward-facing concave with spike at Mach 2.0.

Publications

Presentations

1) Mizukaki, T., Yamada, K.: Characteristics of Self-Sustained-Shock Pulsation around a Forward-facing Concave with Spike, 55th Aerospace Science Meeting. AIAA-2017-0090, 2017

Computational Information

• Parallelization Methods: Serial
• Process Parallelization Methods: n/a
• Thread Parallelization Methods: n/a
• Number of Processes: 1
• Number of Threads per Process: 1
• Number of Nodes Used: 1
• Elapsed Time per Case (Hours): 20
• Number of Cases: 16

Resources Used

Total Amount of Virtual Cost(Yen): 132,817

Breakdown List by Resources

Note: Virtual Cost=amount of cost, using the unit price list of JAXA Facility Utilization program(2016)

JAXA Supercomputer System Annual Report April 2016-March 2017