JAXA Supercomputer System Annual Report April 2016-March 2017

Report Number: R16E0024

• Responsible Representative: Toshio Nishizawa(Aeronautical Technology Directorate, aFJR project team)
• Contact Information: Shunji Enomoto(eno@chofu.jaxa.jp)
• Members: Tsubasa Iwafune, Yusuke Akamisaka, Takuma Kanda, Daisuke Sasaki, Shunji Enomoto, Ryo Inagaki
• Subject Category: Aviation(Aircraft engine)

Abstract

The purpose of aFJR project is to advance research on jet engine component technologies so that Japanese manufacturers can join more effectively in international joint-development projects on next-generation jet engines. We reduce its weight without sacrificing sound-absorbing performance by changing the material to resin.

Goal

Please refer ‘aFJR (Advanced Fan Jet Research) project | ECAT – Environment-Conscious Aircraft Technology Program | Aeronautical Technology Directorate‘.

Objective

Please refer ‘aFJR (Advanced Fan Jet Research) project | ECAT – Environment-Conscious Aircraft Technology Program | Aeronautical Technology Directorate‘.

References and Links

Please refer ‘aFJR (Advanced Fan Jet Research) project | ECAT – Environment-Conscious Aircraft Technology Program | Aeronautical Technology Directorate‘.

Use of the Supercomputer

For the development of light-weight sound-absorbing liner technology in aFJR project, we develop a numerical method to evaluate sound absorption coefficient of sound absorbing liners, and devise improved liners.

Necessity of the Supercomputer

It is necessary to simulate many shapes of absorbing liner in order to search for shapes with high sound absorbing performance.supercomputer with excellent calculation capacity / data capacity is useful for this kind of task.

Achievements of the Year

We attempted to evaluate the sound absorption coefficient of sound absorbing liners by numerical calculation using UPACS-LES which is an analytical code with less attenuation of sound waves using a 6th-order compact scheme. Simulation of the sound absorption performance evaluation test by impedance tubes, calculation of the acoustic wave entering the sound absorbing liner using the axisymmetric two dimensional shape calculation lattice was performed, and the sound absorption coefficient was calculated using the standing wave ratio method. Fig.1 shows pressure field and particle velocity vector at a certain moment generated when a sound wave enters the sound absorbing liner. Fig.2 shows the entropy generated around the hole of the sound absorbing liner, and it can be seen that the sound is absorbed by loss occurring near the hole wall. By applying this method, we are developing a liner shape with a higher sound absorption coefficient.

Fig.1:Sound pressure and velocity vector

Fig.2:Entropy and velocity vector

Publications

N/A

Computational Information

• Parallelization Methods: Hybrid Parallelization
• Process Parallelization Methods: MPI
• Thread Parallelization Methods: OpenMP
• Number of Processes: 12
• Number of Threads per Process: 2
• Number of Nodes Used: 2
• Elapsed Time per Case (Hours): 12
• Number of Cases: 160

Resources Used

Total Amount of Virtual Cost(Yen): 1,829,425

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