JAXA Supercomputer System Annual Report April 2017-March 2018

Research on Space Propulsion Flow Dynamics
Report Number：R17EU0802
Subject Category：Space and Astronautical Science
URL：https://www.jss.jaxa.jp/ar/e2017/4480/
Responsible Representative
Eiichi Sato, Department of Space Flight Systems, Institute of Space and Astronautical Science

Contact Information
Tomoki Matsuno matsuno.tomoki@ac.jaxa.jp

Members
Toru Shimada, Mikiro Motoe, Tomoki Matsuno, Goutham Karthikeyan, Akiyo Takahashi

Abstract
It is natural and logical to require safe and economic space transportation for the realization ofsustainably growing future space economy. However, the current space transportation system cannot be
as safe as the current aircraft because the current rocket has essential explosive nature of the propellant.
In order to realize non-explosive safe rocket, we suggest A-SOFT hybrid rocket and research on
computer simulation of swirling turbulent combustion field and combustion oscillation in hybrid rocket
engine for realization of this type of rocket.
Safety evaluation of hybrid rocket with numerical analysis is also conducted.

Reasons for using of JSS2
It is impossible to conduct practical numerical analysis for turbulent combustion phenomena withgeneral computer from the perspective of computing speed and memory capacity. Therefore high speed
and large scale analysis with super computer is necessary for development of hybrid rocket.

Achievements of the Year
In order to understand the influence of the ratio of axial-to-tangential oxidizer mass flow rate on theinternal combustion flow field of A-SOFT, unsteady combustion turbulent flow analysis is conducted on
2 cases of A-SOFT hybrid rocket. Their difference is only axial-to-tangential oxidizer mass flow rate.
POD analysis is also applied to the simulation results. Fig. 1 shows the comparison of instantaneous eddy
structure. Through this simulation, the difference of engine performance and internal combustion field
are observed.
In order to establish scheme of unsteady combustion simulation for hybrid rocket, Detached-eddy
simulation (DES) have been conducted to the rocket and its results are compared with results of Large-

JAXA Supercomputer System Annual Report April 2017-March 2018eddy Simulation (LES). Fig.2 shows numerical estimations and an experimental result of axial
distribution of fuel regression rate of swirling-oxidizer-flow-type hybrid rocket (numerical estimations
are instantaneous value). Fig.3 shows contours of temperature that are obtained from LES and DES.
These result show that both methods can conduct reasonable simulation for such kind of hybrid rocket.
Numerical analysis on the combustion stability characteristics of hybrid rocket (HR) motors was
conducted in order to study the HR intrinsic low-frequency instability. Through the unsteady
computational fluid dynamics simulation, we were able to model the phenomenon (Fig. 4) andparametrically analyze it.
We studied about safety of space transportation from the view of resilience engineering which is new
method of system safety engineering, and we showed that adoption of boundary layer combustion typehybrid rocket has the possibility of contributing safely. To show the possibility quantitatively, weconstructed a mathematical model including CFD program to evaluate damage of blast of hybrid rocket
propellant.

Fig.1 Eddy structure in the A-SOFT hybrid rocket motor

JAXA Supercomputer System Annual Report April 2017-March 2018

Fig.2 Axial distribution of fuel regression rate(instantaneous)Fig.3 Contour of temperature

Fig.4 Temporal variation of pressure monitored at midpoint of the combustion chamber

JAXA Supercomputer System Annual Report April 2017-March 2018

Publications
 Non Peer-reviewd papers
1) Takahashi, A., Shimada, T., "Essentially Non-explosive propulsion Paving a Way for Fail-Safe SpaceTransportation," TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND
SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN, ISTS Special Issue, Vol.16(2018),
No.1, pp.1-8.
 Presentations
1) M. Motoe, T. Matsuno and T. Shimada, "Numerical Analysis of Combustion Field in Hybrid Rocket
Motor with Swirling and Axial Oxidizer Injection", 7th EUCASS, July 3-6, 2017, Milan, Italy.
2) T. Shimada, T. Matsuno, K. Obata, G. Karthkeyan, and M. Motoe. "Evaluation of Non-steady
Combustion Characteristics of Tangential-Axial Injection Hybrid Rocket by Large Eddy
Simulation." Fourteenth ICFD, November 1-3, 2017, Sendai, Japan.
3) T. Matsuno, M. Motoe, K. Obata, N. Kimura, K. Kitagawa and T. Shimada, "Swirling Combustion
Flow Field Evaluation of Tangential-Axial Injection Hybrid Rocket by Large Eddy Simulation", 9th
AJCPP, March 14-17, 2017, Xiamen, China.
4) Mikiro Motoe, "Delayed Detached Eddy Simulation of Combustive Flows in a Swirling-OxidizerFlow-Type Hybrid Rocket", 31st ISTS, June 3-9, 2017, Matsuyama, Japan.
5) Karthikeyan, Goutham, and Toru Shimada. "Parametric Analysis of Combustion Instability in AxialInjected Hybrid Rocket Motors using Computational Fluid Dynamics", 53rd AIAA/SAE/ASEE Joint
Propulsion Conference, July 10-12, 2017, Atlanta, USA.
6) Karthikeyan, Goutham, and Toru Shimada. "Validation of numerical prediction of hybrid rocket
combustion instability", Fourteenth ICFD, November 1-3, 2017, Sendai, Japan.
7) Takahashi, A., Shiamda, T., "Resilience Engineering of Space Transportation," MechanicalEngineering Congress, 2017 Japan, 9/5, Saitama (in Japanese).
8) Takahashi, A., Shimada, T., "Essentially Non-explosive propulsion Paving a Way for Fail-Safe SpaceTransportation," 31st International Symposium on Space Technology and Science, Matsuyama,2017.6.3-6.9.
9) Takahashi, A., Shimada, T., "Evaluation of Energy for Detonation Occurrence of Space Propulsion
System", Asia Pacific Symposium on Safety 2017, Fukuoka, 2017/12/1.

JAXA Supercomputer System Annual Report April 2017-March 2018

Usage of JSS2
 Computational Information
Parallelization Methods

MPI

Thread Parallelization Methods

N/A

Number of Processes

90

Elapsed Time per Case

3,600.00 hours

 Resources Used
Fraction of Usage in Total Resources*1 (%): 0.86
Details
Computing Resources
System Name

Amount of Core Time (core x hours)

Fraction of Usage*2 (%)

SORA-MA

7,097,640.17

0.94

SORA-PP

23,131.03

0.29

SORA-LM

96.01

0.05

SORA-TPP

0.00

0.00

File System Resources
File System Name

Storage assigned(GiB)

Fraction of Usage*2 (%)/home

1,573.97

1.09

/data

10,971.31

0.20

/ltmp

8,641.10

0.65

Archiver Resources
Archiver System Name

Storage used(TiB)

Fraction of Usage*2 (%)

J-SPACE

6.29

0.27

*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

Numerical investigation of radiation shielding using planetary magnetic fields
Report Number：R17EU0804
Subject Category：Space and Astronautical Science
URL：https://www.jss.jaxa.jp/ar/e2017/4481/
Responsible Representative
Eiichi Sato, Department of Space Flight Systems, Institute of Space and Astronautical Science

Contact Information
Kazuma Emoto kazuma-emoto-vh@ynu.jp

Members
Hitoshi Kuninaka, Yoshinori Takao, Kazuma Emoto

Abstract
For manned space exploration, space radiation causes harsh radiation exposure. To protect crews fromradiation exposure, we propose radiation shielding using planetary magnetic fields. We evaluate themagnetic shielding by numerical simulation because the planetary magnetic field expands the large area.
We simulate space radiation in the planetary magnetic field and clarify the performance of the magnetic
shielding.

Reasons for using of JSS2
We need large-scale parallel computing to simulate trajectories of many energetic particles.

Achievements of the YearWe focus on Martian magnetic anomalies and conducted the simulation of the radiation shielding. We
simulated trajectories of energetic particles using a relativistic Buneman-Brois method and evaluated theradiation shielding using the magnetic anomaly. Figure 1 shows a distribution of normalized particle hitsreaching the Martian surface. The magnetic anomaly could completely shield energetic particles with a
specific incident angle. The complete shielding means that the radiation exposure is zero on the Martiansurface. Martian magnetic anomalies could realize the radiation shielding from energetic particles.

JAXA Supercomputer System Annual Report April 2017-March 2018

Fig.1 A distribution of normalized particle hits

Publications
 Peer-reviewed papers
1) Kazuma Emoto, Yoshinori Takao, and Hitoshi Kuninaka: A Preliminary Study on Radiation
Shielding Using Martian Magnetic Anomalies, Biological Sciences in Space, in press.
 Presentations
1) Kazuma Emoto, Yoshinori Takao, and Hitoshi Kuninaka: A Preliminary Investigation on Radiation
Shielding Using Martian Magnetic Anomalies, Space Transportation Symposium FY2017, STEP2017-021, Sagamihara, January 2018.

JAXA Supercomputer System Annual Report April 2017-March 2018

Usage of JSS2
 Computational Information
Parallelization Methods

MPI

Thread Parallelization Methods

N/A

Number of Processes

3020

Elapsed Time per Case

4.00 hours

 Resources Used
Fraction of Usage in Total Resources*1 (%): 0.04
Details
Computing Resources
System Name

Amount of Core Time (core x hours)

Fraction of Usage*2 (%)

SORA-MA

329,457.50

0.04

SORA-PP

0.00

0.00

SORA-LM

0.00

0.00

SORA-TPP

0.00

0.00

File System Resources
File System Name

Storage assigned(GiB)

Fraction of Usage*2 (%)/home

014.31

0.01

/data

143.05

0.00

/ltmp

2,929.69

0.22

Archiver Resources
Archiver System 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

Study of high speed fluid
Report Number：R17EU0902
Subject Category：Space and Astronautical Science
URL：https://www.jss.jaxa.jp/ar/e2017/4482/
Responsible Representative
Eiichi Sato, Institute of Space and Astronautical Science

Contact Information
Akira Oyama oyama.akira@jaxa.jp

Members
Akira Oyama, Dong Lee, Hiroaki Fukumoto, Takuya Harada, Hiroaki Nakano, Takara Watanabe,
Shota Inoue, Risako Aoki, Shigetaka Kawai, Satoshi Sekimoto, Shun Tamura,
Srikanth Surendranath, Daiki Terakado, Yuta Ozawa, Satoshi Shimomura, Taku Nonomura

Abstract
We conduct fundamental research on aerodynamics such as aerodynamic acoustic noise generated bysupersonic jet and aerodynamic design of Mars aircraft.

Reasons for using of JSS2
Large eddy simulation is required for analysis of aeroacoustics generated from a supersonic jet.
Aerodynamic design of Mars airplane requires several hundred cases of CFD computation. Therefore, asupercomputer is necessary.

Achievements of the Year
Aerodynamic airfoil design optimization of flying-wing-type Mars airplane has been conducted. The
result show that there is a tradeoff between maximizing lift to drag ratio and improving stability
performance. A guideline for airfoil shape design has been also obtained. We also conducted uncertainty
quantification of aerodynamic performance of an airfoil in low Reynolds number flow condition.

JAXA Supercomputer System Annual Report April 2017-March 2018

Fig.1 Aerodynamic airfoil design optimization of flying-type Mars airplane

Fig.2 Uncertainty quantification of airfoil performance in low Reynolds number flow

JAXA Supercomputer System Annual Report April 2017-March 2018

Publications
 Non peer-reviewed papers
1) Takuya Harada, Koji Fujita, Akira Oyama, Hiroya Mamori, Makoto Yamamoto, Aerodynamic
Design of Airfoil for Flying Wing Mars Airplane, AIAA Scitech, Kissimmee, FL, US, Jan 8-12. 20182) Shigetaka Kawai, Thijs Bouwhuis, Yoshiaki Abe, Aiko Yakeno, Taku Nonomura, Akira Oyama,
Harry Hoeijmakers, and Kozo Fujii, Investigation of Maximum Velocity Induced by Body-Force
Fields for Simpler Modeling of Plasma Actuators, AIAA Aerospace Sciences Meeting, AIAA Scienceand Technology Forum and Exposition 2018, Kissimmee, FL, US, Jan 8-12. 2018
3) Hiroaki Fukumoto, Hikaru Aono, Taku Nonomura, Akira Oyama and Kozo Fujii, Large-Eddy
Simulations of Flow Control Effects of a DBD Plasma Actuator at Various Burst Frequencies on a
Dynamic Floweld around a Pitching NACA0012 Airfoil at Reynolds Number of 256,000, AIAA
Aerospace Sciences Meeting, AIAA Science and Technology Forum and Exposition 2018,
Kissimmee, FL, US, Jan 8-12. 2018.

JAXA Supercomputer System Annual Report April 2017-March 2018

Usage of JSS2
 Computational Information
Parallelization Methods

parametric study.

Thread Parallelization Methods

OpenMP

Number of Processes

52

Elapsed Time per Case

16.00 hours

 Resources Used
Fraction of Usage in Total Resources*1 (%): 1.83
Details
Computing Resources
System Name

Amount of Core Time (core x hours)

Fraction of Usage*2 (%)

SORA-MA

14,918,585.64

1.97

SORA-PP

1,596.63

0.02

SORA-LM

0.00

0.00

SORA-TPP

0.00

0.00

File System Resources
File System Name

Storage assigned(GiB)

Fraction of Usage*2 (%)/home

3,621.92

2.51

/data

86,487.83

1.60

/ltmp

18,013.20

1.36

Archiver Resources
Archiver System Name

Storage used(TiB)

Fraction of Usage*2 (%)

J-SPACE

3.98

0.17

*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

Numerical Simulation of Advanced Spacecraft Propulsion
Report Number：R17EU0904
Subject Category：Space and Astronautical Science
URL：https://www.jss.jaxa.jp/ar/e2017/4483/
Responsible Representative
Eiichi Sato, Department of Space Flight Systems, Institute of Space and Astronautical Science

Contact Information
Ikkoh Funaki funaki.ikkoh@jaxa.jp

Members
Shitan Tauchi, Hiroyuki Arai

Abstract
Numerical and physical modeling of Magnetoplasmadynamic arcjet and other advanced spacecraft
propulsion for future large space mission are conducted. Also, based on the modeling, performance
prediction tool is organized.

Reasons for using of JSS2
Enough calculation resources (CPU and memory) are required to perform plasma simulation and to
optimize spacecraft propulsion's performance.

Achievements of the YearTo clarify the plasma behavior on a self-field magnetoplasmadynamic thruster (SF-MPDT) at thecritical current operation using hydrogen as a propellant, the flow-field was simulated numerically. In
the simulation code, the ion-slip effect is incorporated as a numerical model. The numerical simulation
was conducted for discharge current J = 5 kA, 10 kA (critical current) and mass flow rate of 0.4 g/s, inorder to understand the plasma conditions at critical current level. At the critical current, the current
path was extended to downstream of discharge chamber by increasing magnetic flux density and Hall
effect, therefore the pressure raised at cathode tip and central axis. The blowing force was increasing at
the critical current, because the current distribution at cathode tip was 5 times as large as the case of 5
kA and the self-induced magnetic field was equally increased. The ion-slip parameter was significantly
occurred in large part of discharge chamber at the critical current (Sion greater than unity). The ion-slip
heating was occurred at the supersonic region, and its caused to suppress the gas dynamic thrust.

JAXA Supercomputer System Annual Report April 2017-March 2018

Publications
 Presentations
1) Shin Tauchi, Akira Kawasaki, Masakatsu Nakane, Kenichi Kubota, Ikkoh Funaki, Numerical
Analysis of the Effect of Cathode Configuration on Hydrogen MPD Thruster Performance, Asian
Joint Conference on Propulsion and Power, AJCPP2018-027, March 2018, Xiamen.

Usage of JSS2
 Computational Information
Parallelization Methods

MPI

Thread Parallelization Methods

Automatic Parallelizatio

Number of Processes

32 - 512

Elapsed Time per Case

10.00 hours

 Resources Used
Fraction of Usage in Total Resources*1 (%): 0.04
Details
Computing Resources
System Name

Amount of Core Time (core x hours)

Fraction of Usage*2 (%)

SORA-MA

64,935.21

0.01

SORA-PP

36,403.88

0.46

SORA-LM

0.00

0.00

SORA-TPP

0.00

0.00

File System Resources
File System Name

Storage assigned(GiB)

Fraction of Usage*2 (%)/home

047.68

0.03

/data

476.84

0.01

/ltmp

9,765.63

0.74

Archiver Resources
Archiver System 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

NLFFF calculation of the solar coronal magnetic field based on Hinode observations
Report Number：R17EU0912
Subject Category：Space and Astronautical Science
URL：https://www.jss.jaxa.jp/ar/e2017/4484/
Responsible Representative
Masaki Fujimoto, Department of Solar Sciences, ISAS

Contact Information
Toshifumi Shimizu shimizu.toshifumi@jaxa.jp

Members
Toshifumi Shimizu, Yusuke Kawabata, Takahiro Hasegawa, Tamafumi Doi, Yumi Bamba

Abstract
The purpose of this project is to physically understand the mechanisms responsible for the occurrenceof solar flares. The Hinode satellite has been accurately measuring magnetic fields spatially distributedat the solar surface. Using maps of the measured magnetic fields,

we infer 3D magnetic field structuresin the solar corona by performing 3D magnetohydrodynamics simulations. With 3D magnetic fieldstructures derived from the simulations, we promote studies for exploring physical mechanisms involvedin the occurrence of solar flares.

Reasons for using of JSS2
We perform 3D magnetohydrodynamics numerical simulations by using vector magnetic field dataacquired with the Hinode satellite in order to infer 3D magnetic field structures in the corona. We needlarge computational resource in order to perform three-dimensional magnetohydrodynamics simulations.

Achievements of the Year
Nonlinear force-free field (NLFFF) modeling is a useful tool to infer the three-dimensional magnetic
fields in the solar corona, where the force-free approximation is valid. If we give the magnetic fieldobserved at the solar surface as a boundary condition, we can solve this nonlinear equation. However,
the NLFFF modeling is known to have some uncertainties. We investigate one of the uncertainties; Initialcondition dependency. Usually, NLFFF calculation starts from potential field. In our study, we used
liner force-free field(LFFF) and investigated how the NLFFF solutions are affected by the initialcondition. We found that the total magnetic energy and free energy is independent from the initialcondition (Fig.1), although the shape of the field lines are different among each solution (Fig.2). Whilethe difference of the shape of the field lines is small in the lower atmosphere, it becomes larger in the

JAXA Supercomputer System Annual Report April 2017-March 2018heigher region. This is because the field lines in the lower atmosphere is affected by the bottom boundary
and tends to be independent from the initial condition.

Fig.1 Magnetic energy of the initial condition (blue), NLFFF(red), and free energy(green,
the difference between NLFFF and potential field)

JAXA Supercomputer System Annual Report April 2017-March 2018

Fig.2 Comparison between X-ray image obtained with Hinode and field lines
derived from NLFFF.

Publications
 Peer-reviewed papers
1) Y. Kawabata, S. Inoue, and T. Shimizu, "Non-potential Field Formation in the X-shaped
Quadrupole Magnetic Field Configuration", The Astrophysical Journal, 842, 106, 2017 Presentations
1) Y. Kawabata, A. Asensio Ramos, S. Inoue, T. Shimizu:"Comparison between chromospheric field
derived from He I 10830 A observation and nonlinear force-free field modeling from photosphere",
ASJ meeting, Hokkaido University, September 2017.
2) Takahiro Hasegawa, Toshifumi Shimizu: "Reversed Rotation of a Sunspot Associated with the X2.1
flare in NOAA 12297", Daiwa-Adrian Workshop, London, UK, July 2017.
3) Takahiro Hasegawa, Toshifumi Shimizu: "Reversed rotation of a sunspot and large-scale flare", ASJ
meeting, Hokkaido University, September 2017.
4) Takahiro Hasegawa, Toshifumi Shimizu, "Reversed Rotation of the Well-Developed Sunspot
Associated with an X-class Flare", Helicity Thinkshop, Tokyo, November, 2017
5) Takahiro Hasegawa, Toshifumi Shimizu:"Observational studies on magnetic helicity associated withsolar flares", 25th Hinode-Laboratory Plasma meeting, Tokyo University, February, 2018

JAXA Supercomputer System Annual Report April 2017-March 2018

 Other
1) Takahiro Hasegawa: "Observational Studies on Magnetic Helicity Associated with Solar Flares",
Master thesis, The University of Tokyo, March 2018.

Usage of JSS2
 Computational Information
Parallelization Methods

MPI

Thread Parallelization Methods

N/A

Number of Processes

12

Elapsed Time per Case

5.00 hours

 Resources Used
Fraction of Usage in Total Resources*1 (%): 0.13
Details
Computing Resources
System Name

Amount of Core Time (core x hours)

Fraction of Usage*2 (%)

SORA-MA

0.00

0.00

SORA-PP

62,736.30

0.79

SORA-LM

0.00

0.00

SORA-TPP

84,134.72

9.39

File System Resources
File System Name

Storage assigned(GiB)

Fraction of Usage*2 (%)/home

033.65

0.02

/data

334.59

0.01

/ltmp

6,835.94

0.52

Archiver Resources
Archiver System 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

Research and Development of Sample Return Capsule for future planetary exploration
Report Number：R17EU1600
Subject Category：Space and Astronautical Science
URL：https://www.jss.jaxa.jp/ar/e2017/4485/
Responsible Representative
Kazuyuki Miho, ISAS Program Office

Contact Information
Kazuhiko Yamada yamada.kazuhiko@jaxa.jp

Members
Kazuhiko Yamada, Yusuke Higo, Kazuki Nohara, Tomoya Kazama

Abstract
Hayabusa' is the first sample return mission to an asteroid in deep space and proved its significanceworldwide. The sample return mission will become one of the important missions in future planetary
exploration. A sample return capsule is indispensable technology to realize it. The objectives of thisactivity are to take over its heritage and to enhance its technology in order to realize the flexible andattractive future sample return mission.

Reasons for using of JSS2
Computational fluid dynamics related the sample return capsule was carried out using super computer.
These results will be reflected in the design of future sample return capsules. It is generally difficult toreproduce the fluid dynamic condition in free flight of sample return capsule in ground tests. The
numerical simulation is useful to understand the fluid dynamics phenomenon. However, the numericalsimulation related to fluid dynamics requires the large computational resource. So, the super computeris indispensable. Its complex fluid dynamics around the sample return capsule can be understood,
combining the results of both ground tests and numerical analyses using a super computer.

Achievements of the YearIn this year, the numerical fluid analysis was carried out, focused on the wake flow field of Hayabusatype sample return capsule using the numerical code with Baldwin-Lomax turbulence model (Fig.1). A
wake flow field is important information for the design of the parachute deployment method and for theevaluation of the aerodynamic instability. In this study, the effect of the flow conditions including anangle of attach and an uniform velocity on the wake flow field was investigated (Fig.2). Additionally,
these numerical results were compared with experimental results, that is visualized wake flow in low

JAXA Supercomputer System Annual Report April 2017-March 2018

speed wind tunnel by PIV method in order to confirm the validity of the adopted numerical analysis
method (Fig.3). In the future, this numerical code and method will be utilized for the development of
the aerodynamics database to the future sample return capsule design and for the evaluation of
aerodynamic performance.

Fig.1 Computational gridFig.2 Flow field around the Hayabusa-type sample return capsule in the case ofvairious angle of attacks.

JAXA Supercomputer System Annual Report April 2017-March 2018

Fig.3 Comparison between CFD results and wind tunnle results about velocity
profile in wake flow

Publications
 Presentations
1) Kazuki Nohara, "Numerical simulation and flow visualization of wake flow field of Hayabusa-Type
sample return capsule",Symposium on Flight Mechanics and Astrodynamics: 2017, sagamihara.

JAXA Supercomputer System Annual Report April 2017-March 2018

Usage of JSS2
 Computational Information
Parallelization Methods

MPI

Thread Parallelization Methods

N/A

Number of Processes

64

Elapsed Time per Case

104.00 hours

 Resources Used
Fraction of Usage in Total Resources*1 (%): 0.01
Details
Computing Resources
System Name

Amount of Core Time (core x hours)

Fraction of Usage*2 (%)

SORA-MA

80,382.74

0.01

SORA-PP

15.28

0.00

SORA-LM

0.00

0.00

SORA-TPP

0.00

0.00

File System Resources
File System Name

Storage assigned(GiB)

Fraction of Usage*2 (%)/home

028.61

0.02

/data

286.10

0.01

/ltmp

5,859.38

0.44

Archiver Resources
Archiver System 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