Accelerating deep reinforcement learning strategies of flow control through a multi-environment approach

J Rabault, A Kuhnle - Physics of Fluids, 2019 - pubs.aip.org
Deep Reinforcement Learning (DRL) has recently been proposed as a methodology to
discover complex active flow control strategies [Rabault et al.,“Artificial neural networks …

Three flow features behind the flow control authority of DBD plasma actuator: Result of high-fidelity simulations and the related experiments

K Fujii - Applied Sciences, 2018 - mdpi.com
Both computational and experimental studies are conducted for understanding of the flow
separation control mechanism of a DBD (dielectric barrier discharge) plasma actuator. Low …

Flow control methods and their applicability in low-Reynolds-number centrifugal compressors—a review

J Tiainen, A Grönman, A Jaatinen-Värri… - International Journal of …, 2017 - mdpi.com
The decrease in the performance of centrifugal compressors operating at low Reynolds
numbers (eg, unmanned aerial vehicles at high altitudes or small turbomachines) can reach …

Unified mechanisms for separation control around airfoil using plasma actuator with burst actuation over Reynolds number range of 103–106

M Sato, K Okada, K Asada, H Aono, T Nonomura… - Physics of …, 2020 - pubs.aip.org
We conduct large-eddy simulations of separated airfoil flows with control by a dielectric-
barrier-discharge plasma actuator over a wide range of Reynolds numbers. The Reynolds …

Closed-loop flow separation control using the deep Q network over airfoil

S Shimomura, S Sekimoto, A Oyama, K Fujii, H Nishida - AIAA Journal, 2020 - arc.aiaa.org
The effectiveness of closed-loop flow control using a deep Q network (DQN), such as deep
reinforcement learning algorithm, was experimentally researched for a NACA0015 airfoil …

Burst-mode frequency effects of dielectric barrier discharge plasma actuator for separation control

S Sekimoto, T Nonomura, K Fujii - AIAA journal, 2017 - arc.aiaa.org
The various separation control mechanisms of burst-mode actuation with a dielectric barrier
discharge plasma actuator were experimentally investigated in this study. The control of the …

[HTML][HTML] Dynamic mode decomposition using a Kalman filter for parameter estimation

T Nonomura, H Shibata, R Takaki - AIP Advances, 2018 - pubs.aip.org
A novel dynamic mode decomposition (DMD) method based on a Kalman filter is proposed.
This paper explains the fast algorithm of the proposed Kalman filter DMD (KFDMD) in …

Extended-Kalman-filter-based dynamic mode decomposition for simultaneous system identification and denoising

T Nonomura, H Shibata, R Takaki - PloS one, 2019 - journals.plos.org
A new dynamic mode decomposition (DMD) method is introduced for simultaneous system
identification and denoising in conjunction with the adoption of an extended Kalman filter …

Quasi-stationary modeling of the DBD plasma flow control around airfoil

K Adamiak - Physics of Fluids, 2020 - pubs.aip.org
This paper presents the results of numerical simulation of a dielectric barrier discharge
(DBD) plasma actuator and shows its effectiveness to control air flow around the NACA …

Mechanisms for turbulent separation control using plasma actuator at Reynolds number of 1.6× 106

M Sato, K Asada, T Nonomura, H Aono, A Yakeno… - Physics of …, 2019 - pubs.aip.org
We have conducted large-eddy simulations of turbulent separated flows over a NACA0015
airfoil with control by a plasma actuator. The Reynolds number based on the chord length is …