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Research of unsteady flow simulation toward prediction of full flight envelope

JAXA Supercomputer System Annual Report April 2019-March 2020

Report Number: R19EDA201N01

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Takashi Aoyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
  • Contact Information: Atsushi Hashimoto, Aeronautical Technology Directorate, Numerical Simulation Research Unit(hashimoto.atsushi@jaxa.jp)
  • Members: Takashi Ishida, Atsushi Hashimoto, Kenji Hayashi, Takashi Aoyama, Takahiro Yamamoto, Masashi Kanamori, Yuki Ide, Hideaki Aiso, Keita Nakamoto, Andrea Sansica, Tomoaki Matsuzaki, Paul Zehner, Hisato Takeda, Yoimi Kojima, Yuuki Asada, Kanako Yasue, Ryosuke Fuse, Kei Shimura, Ryohei Kirihara, Manabu Hishida

Abstract

The research related to unsteady flow simulation of the aircraft buffet phenomenon is conducted aimed for the prediction of full-flight envelope.

Reference URL

Please refer to ‘Numerical simulation technology | Science & Basic Tech. – Aeronautical Science and Basic Technology Research | Aeronautical Technology Directorate‘.

Reasons and benefits of using JAXA Supercomputer System

A huge amount of computational resources is needed to simulate the aircraft buffet phenomenon which is high-Reynolds number and complex flow including flow separation.

Achievements of the Year

We have simulated low-speed and high-speed buffet toward CFD prediction of full flight envelope. We employed a lattice Boltzmann method(LBM) for the low-speed buffet. Combinig the LBM with a building cube method(BCM) enable large-scale computation. Figure 1 is a result of low-speed buffet simulation on NASA-CRM, where 400M cells are employed in the simulation. The small vortices at the separated shear layer are well resolved. Figure 2 is a result of gloabal stability analysis of high-speed buffet. The unstable modes related with the shock oscillation is obtained. The frequency of the unstable mode increases with the swept angle, which agrees with previous reports qualitatively.

Annual Reoprt Figures for 2019

Fig.1: LBM analysis of low-speed buffet on NASA-CRM

 

Annual Reoprt Figures for 2019

Fig.2: Global stability analysis of high-speed buffet on swept wing

 

Publications

– Peer-reviewed papers

1) Andrea Sansica, Hashimoto Atsushi, Ohmichi Yuya, Global Stability Analysis of the JAXA H-ll Transfer Vehicle Re-Entry Capsule, IUTAM Transition 2019, submitted

– Non peer-reviewed papers

1) Andrea Sansica, Hashimoto Atsushi, Jean-Christophe Robinet, Supersonic Sphere Flow Unstable Bifurcations, 32nd International Symposium on Shock Waves

– Oral Presentations

1) Takashi Ishida, Daichi Asaoka, Masaharu Kameda, Unsteady flow simulation around an airfoil with low-speed and high angle-of-attack conditions by Lattice Boltzmann Method, 33th CFD Symposium

2) Takashi Ishida, Takahiro Yamamoto, Kenji Hayashi, Keita Nakamoto, Yuya Ohmichi, Masashi Kanamori, Takashi Aoyama, Introduction of JAXA’s Research Activities on Elucidation and Prediction of Buffet Phenomena on Aircraft, The 51th Fluid Dynamics Conference/The 37th Aerospace Numerical Simulation

3) Andrea Sansica, Hashimoto Atsushi, Side-Wall Effects on the Global Stability of Swept and UnsweptWings at Buffet Conditions, The 51th Fluid Dynamics Conference/The 37th Aerospace Numerical Simulation Symposium

4) Ishida Takashi, Flow Simulation around 30P30N with BOXFUN Grid, APC-V

5) Hisato Takeda, Takahiro Yamamoto, Kenji Hayashi, Takashi Ishida, Ryotaro Sakai, Atsushi Hashimoto, Takashi Aoyama, Computation of 30P30N in Various Turbulence Models by FaSTAR Code, APC-V

– Poster Presentations

Takashi Ishida, Kazuyuki Nakakita, Masashi Kanamori, Yuya Ohmichi, Andrea Sancica, Kanako Yasue, Masataka Kohzai, Shunsuke Koike, Yosuke Sugioka, Research on prediction of buffet phenomena in ISSAC project, JAXA Aeronautical Symposium 2019

Usage of JSS2

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 128 – 2048
  • Elapsed Time per Case: 240 Hour(s)

Resources Used

 

Fraction of Usage in Total Resources*1(%): 6.14

 

Details

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

Computational Resources
System Name Amount of Core Time
(core x hours)
Fraction of Usage*2(%)
SORA-MA 54,477,608.38 6.62
SORA-PP 218,092.71 1.41
SORA-LM 12,151.02 5.07
SORA-TPP 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 633.93 0.53
/data 63,941.54 1.09
/ltmp 13,710.69 1.16

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 102.86 2.59

*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 2019-March 2020