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Application of distributed micro plasma actuators

JAXA Supercomputer System Annual Report February 2023-January 2024

Report Number: R23EACA47

Subject Category: JSS Inter-University Research

PDF available here

  • Responsible Representative: Takashi Matsuno, Associate Professor, Tottori University
  • Contact Information: Takashi Matsuno(matsuno@tottori-u.ac.jp)
  • Members: Rikiya Hata, Nana Hasegawa, Masahiro Kanazaki, Seiichiro Morizawa, Takashi Matsuno, Taisei Nishimura

Abstract

Plasma actuators (PAs) are flow control devices that use discharged plasma to generate wall jets from smooth surfaces. In recent years, a method of generating a distribution of body force on a surface by using a large number of small-scale PAs has been proposed by the applicants. The objective of this study is to obtain knowledge about the application method of plasma actuator and its optimization method for arbitrary control of the velocity profile of a three-dimensional boundary layer, keeping in mind the boundary layer control of high-speed flows.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

In order to perform large-scale 3D flow analysis and aerodynamic optimization with high computational costs, a supercomputer is required. The JAXA supercomputer, which provides an environment for the use of computational tools, is the most suitable environment for this study.

Achievements of the Year

In the current year, our research advanced in exploring the efficacy of optimal design and data mining methodologies applied to our studies. We undertook a design exploration for a separation control device on two-dimensional simplistic geometry as a benchmark test, through which we validated the applicability of our design methodology to real problems. This exploration included aerodynamic analyses employing Reynolds-Averaged Navier-Stokes (RANS) computations and solving optimization problem with a developed optimal design tool. This process aimed to assess the utility of the optimal design and data mining approaches for the gathered data. Numerical simulations were conducted using FaSTAR, a tool developed by JAXA, alongside HexaGrid for automatic grid generation, also a JAXA product. The computational grid was compact, comprising 200,000 points. For the optimal design phase, a spline function facilitated the geometrical definition from an extensive array of design points. This allowed for the analysis and identification of solutions across several hundred samples, with the grid being dynamically generated via diverse modifications to the spline function.

Figure 1 presents a scatter plot matrix showing the outcomes of the design exploration. This illustrates the correlations among the forward projection (x/H), lateral extension (z/H), front edge curvature (x_curv.), lateral curvature (z_curv.), and the drag coefficient (Cd) of the control device applied to a two-dimensional prism model. The instances where Cd reduction surpassed 50% are marked with blue dots in the figure. Notably, the device configurations that achieved a lower drag coefficient featured a more extended forward projection than lateral overhang, greater curvature at the nose, and lesser curvature at the sides, aligning nearly parallel with the airflow. The methodologies employed in this study have demonstrated the potential for optimal design of the specified microfluidic device and the identification of its effective configuration characteristics.

Annual Reoprt Figures for 2023

Fig.1: Scatter plot matrix of shape features of the flow control device and drag coefficient.

 

Publications

N/A

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 12 – 48
  • Elapsed Time per Case: 15 Minute(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.00

 

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 3.68 0.00
TOKI-ST 495.27 0.00
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 163.33 0.14
/data and /data2 12913.00 0.08
/ssd 0.00 0.00

 

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.

 

ISV Software Licenses Used

ISV Software Licenses Resources
ISV Software Licenses Used
(Hours)
Fraction of Usage*2(%)
ISV Software Licenses
(Total)
0.00 0.00

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

JAXA Supercomputer System Annual Report February 2023-January 2024