Model reduction for flow analysis and control

CW Rowley, STM Dawson - Annual Review of Fluid Mechanics, 2017 - annualreviews.org
Advances in experimental techniques and the ever-increasing fidelity of numerical
simulations have led to an abundance of data describing fluid flows. This review discusses a …

Modeling lift hysteresis on pitching airfoils with a modified Goman–Khrabrov model

DR Williams, F Reißner, D Greenblatt, H Müller-Vahl… - AIAA Journal, 2017 - arc.aiaa.org
Wind-tunnel experiments were conducted on two symmetric airfoils with different thickness
ratios as a test of the ability of Goman–Khrabrov-type models to predict the lift coefficient …

Characterisation of unsteady separation in a turbulent boundary layer: Reynolds stresses and flow dynamics

F Ambrogi, U Piomelli, DE Rival - Journal of Fluid Mechanics, 2023 - cambridge.org
The large-eddy simulation technique was used to investigate the dynamics of unsteady flow
separation on a flat-plate turbulent boundary layer. The unsteadiness was generated by …

Characterization of unsteady separation in a turbulent boundary layer: mean and phase-averaged flow

F Ambrogi, U Piomelli, DE Rival - Journal of Fluid Mechanics, 2022 - cambridge.org
A spatially developing turbulent boundary layer subject to a space-and time-dependent
pressure gradient is analysed via large-eddy simulation. The unsteadiness is prescribed by …

Modelling the unsteady lift of a pitching NACA 0018 aerofoil using state-space neural networks

L Damiola, J Decuyper, MC Runacres… - Journal of Fluid …, 2024 - cambridge.org
The development of simple, low-order and accurate unsteady aerodynamic models
represents a crucial challenge for the design optimisation and control of fluid dynamical …

Alleviating unsteady aerodynamic loads with closed-loop flow control

DR Williams, R King - AIAA Journal, 2018 - arc.aiaa.org
The practical benefits and issues related to controlling unsteady loads in gusting flows with
active flow control actuators are discussed. Recent methods used to model the response of …

Iterative maneuver optimization in a transverse gust encounter

X Xu, A Gementzopoulos, G Sedky, AR Jones… - AIAA Journal, 2023 - arc.aiaa.org
This paper presents a framework based on either iterative simulation or iterative
experimentation for constructing an optimal, open-loop maneuver to regulate the …

An assessment of the state-of-the-art from the 2019 ARO dynamic stall workshop

MJ Smith - AIAA Aviation 2020 Forum, 2020 - arc.aiaa.org
Dynamic stall has been a limiting factor in design and operation on rotating systems within
the rotorcraft, propulsion, and sustainable energy disciplines for more than forty years …

Pressure feedback control of aerodynamic loads on a delta wing in transverse gusts

X He, DR Williams - AIAA Journal, 2023 - arc.aiaa.org
A feedback active flow control (AFC) scheme is studied for control of unsteady aerodynamic
loads that act on a generic tailless delta wing during transverse gust encounters. The …

Gust mitigation through closed-loop control. I. Trailing-edge flap response

JE Pohl, R Radespiel, B Herrmann, SL Brunton… - Physical Review …, 2022 - APS
We quantify and model the airfoil response to its pitching flap using a comprehensive
experimentally acquired database at chord-based Reynolds number 1.8× 10 6. This …