Design optimization of distributed micro plasma actuators for flow control

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EACA47

Subject Category: JSS Inter-University Research

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

Abstract

Plasma actuators (PAs) are flow control devices that generate wall jets on smooth surfaces using discharge plasma and have high potential for aerodynamic applications. The objective of this project is to establish application and optimization methodologies for PAs to realize transition control in three-dimensional boundary layers under high-speed flow conditions. In particular, the project targets swept-wing configurations and aims to obtain design guidelines for suppressing crossflow instability and controlling boundary-layer transition through integrated treatment of PA body-force distribution and aerodynamic design. In parallel, we develop an integrated CFD and design-optimization workflow to provide a reproducible computational foundation for large-scale design exploration and high-fidelity analysis.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

This project requires a combination of high-fidelity simulations for transition phenomena in three-dimensional swept-wing boundary layers and large numbers of design exploration runs. Such computations are difficult to perform on ordinary computing resources and therefore require a massively parallel environment. The JAXA Supercomputer System provides a well-suited environment for aerodynamic simulations, especially through access to FaSTAR and related computational tools. The workflow development and integrated verification carried out this year also provide an important basis for stable and reproducible execution of future large-scale design studies and high-fidelity simulations.

Achievements of the Year

This fiscal year, as a preliminary step toward the full-scale study of plasma actuator design optimization and high-fidelity numerical analysis for the boundary layer over a swept wing, we developed and verified an integrated computational framework linking CFD and optimization. Specifically, we implemented an integrated workflow, organized the management of computational conditions and input/output data, established reproducible execution procedures, and built a framework for stable design exploration over many cases. We also organized the system configuration so that the execution environment developed on the laboratory workstation could be migrated smoothly to the JSS system. In addition, we improved the variable reduction method and identified issues in the integrated implementation, thereby establishing a computational environment for large-scale design problems involving PA body-force distributions and related design variables. This fiscal year, the main focus was placed on the development and verification of the computational and optimization framework suited to this project, rather than on the accumulation of large-scale computational results themselves.

Publications

- Poster Presentations

Sogo Ito, Takumi Nakagawa, Takashi Matsuno, Masahiro Kanazaki, "Optimal design and scale effects of fairings installed at the front corner of a bluff body," 56th Annual Meeting of the Japan Society for Aeronautical and Space Sciences, 2025, Tokyo.

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 2 - 196
Elapsed Time per Case: 10 Minute(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.09

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	2198597.45	0.10
TOKI-ST	36884.06	0.04
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	4329.78	0.33
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	0.00	0.00
/data and /data2	2048.00	0.01
/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)	1496.70	1.05

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