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Three-dimensional numerical simulation of discharge and flow related to airflow control using plasma actuator

JAXA Supercomputer System Annual Report February 2022-January 2023

Report Number: R22EACA16

Subject Category: JSS Inter-University Research

PDF available here

  • Responsible Representative: Naofumi Ohnishi, Professor, Tohoku University
  • Contact Information: Naofumi Ohnishi(naohnishi@tohoku.ac.jp)
  • Members: Naofumi Ohnishi, Shintaro Sato, Hideto Tamura

Abstract

Plasma actuator has attracted attention as a fluid control device using dielectric barrier discharge. In the experimental study, it has been pointed out that the discharge has a spanwise distribution of the electrode and has a three-dimensional structure. The three-dimensional structure affects the induced flow distribution of the plasma actuator. In this study, we perform the three-dimensional numerical calculation of discharge and flow for verification of airflow control effect of plasma actuator.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

In the calculation of the discharge phenomenon, it is necessary to solve Poisson’s equation at every time step, and it is solved using a convergence calculation, which calculation cost is high. In addition, since three-dimensional calculations are performed in this research, the required memory capacity is so large, and a supercomputer is necessary.

Achievements of the Year

We conducted a three-dimensional calculation of the discharge process toward the coupled calculation of the discharge and the fluid. Previous research has pointed out that the electrodes of plasma actuators have protrusions of several tens of micrometers. We established a calculation method using general coordinate transformation to reproduce the protrusions of the electrodes, and the calculation was performed using a boundary-fitted mesh that fit the shape of the protrusion. In addition, we investigated influences of splitting the covered electrode on discharge structures. As a result, with splitting the covered electrode, the effect of the protrusions on the discharge structure becomes weak, and the identical discharge structure was maintained regardless of the position of the protrusion (Fig.1). We will conduct coupled calculation of discharge and fluid in future work to investigate the effect of the three-dimensional discharge structure on the fluid field.

Annual Reoprt Figures for 2022

Fig.1: The discharge structure with splitting the covered electrode.

 

Publications

– Oral Presentations

(1) Hideto Tamura, Shintaro Sato, and Naofumi Ohnishi, Discharge structure control of surface dielectric barrier discharge by splitting

covered electrode, 46th Conference of the institute of electrostatics, September 7-10 2022.

(2) Hideto Tamura, Shintaro Sato, and Naofumi Ohnishi, Numerical simulation of discharge process in surface dielectric-barrier-discharge on split covered electrode, 75th Annual Gaseous Electronics Conference, American Physical Society, October 3-7 2022.

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 8 – 720
  • Elapsed Time per Case: 9 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.36

 

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name CPU Resources Used
(Core x Hours)
Fraction of Usage*2(%)
TOKI-SORA 1224519.16 0.05
TOKI-ST 2473963.96 2.47
TOKI-GP 0.00 0.00
TOKI-XM 0.00 0.00
TOKI-LM 0.00 0.00
TOKI-TST 0.00 0.00
TOKI-TGP 0.00 0.00
TOKI-TLM 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 113.33 0.10
/data and /data2 35840.00 0.28
/ssd 183.33 0.03

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 3.47 0.02

*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.

 

ISV Software Licenses Used

ISV Software Licenses Resources
ISV Software Licenses Used
(Hours)
Fraction of Usage*2(%)
ISV Software Licenses
(Total)
144.79 0.10

*2: Fraction of Usage:Percentage of usage relative to each resource used in one year.

JAXA Supercomputer System Annual Report February 2022-January 2023