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Study of calculation method for chemical reactions in turbulent combustion

JAXA Supercomputer System Annual Report April 2017-March 2018

Report Number: R17ETET25

Subject Category: Skills Acquisition System

PDF available here

  • Responsible Representative: Takashi Aoyama, Aeronautical Technology Directorate, Numerical Simulation Research Unit
  • Contact Information: Yusuke Komatsu ksw.koma2@asagi.waseda.jp
  • Members: Yusuke Komatsu

Abstract

For the purpose of realization of hypersonic transport, research and development aiming at demonstration of integrated control technology for aircraft / propulsion under hypersonic conditions is under way. It is difficult to acquire the data necessary for the performance evaluation of the ramjet engine mounted on the experimental aircraft only by the combustion test. Therefore, numerical analysis is necessary to interpolate the experimental data and to understand the phenomena in the combustor. Then, we develop a reacting flow solver with detailed chemical kinetics based on the CFD solver FaSTAR developed by JAXA. In addition, a verification calculation of this solver is conducted on the two-dimensional shape.

Reference URL

N/A

Reasons for using JSS2

When numerical analysis including chemical reactions is performed on the actual combustor scale, the calculation cost becomes very large. Therefore, we used JSS2 which can parallelize.

Achievements of the Year

We developed a reacting flow solver with detailed chemical kinetics by implementing species transport equations and Arrhenius equation in the CFD solver FaSTAR developed by JAXA. We also implemented a time integration method combining LU-SGS method and Point-Implicit method.

Numerical analysis was carried out with this solver for the premixed flow in the two-dimensional channel as a verification calculation, and the result quantitatively agreed with the analytical solution(Fig. 1). In addition, in the analysis of the supersonic diffusion combustion experiment conducted by Burrows and Kurkov, relatively large errors occurred in the distribution of species mass fraction and temperature, but their maximum values agreed with the experimental results(Fig. 2, 3).

Annual Reoprt Figures for 2017

Fig.1: O2 mass fractions along the main flow direction(line : Numerical solution, plot : analytical solution)

 

Annual Reoprt Figures for 2017

Fig.2: Static temperature contours in test section

 

Annual Reoprt Figures for 2017

Fig.3: H2O mole fractions and total temperature at test section exit

 

Publications

N/A

Usage of JSS2

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 32 – 64
  • Elapsed Time per Case: 120.00 hours

Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.68

 

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 5,618,850.84 0.75
SORA-PP 3,882.99 0.05
SORA-LM 1.60 0.00
SORA-TPP 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 476.84 0.33
/data 9,765.63 0.18
/ltmp 1,953.13 0.15

 

Archiver Resources
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