Input-output analysis, model reduction and control of the flat-plate boundary layer

• The dynamics and control of two-dimensional disturbances in the spatially evolving boundary layer oil a flat plate are investigated from an input output viewpoint. A set-up of spatially localized inputs (external disturbances and actuators) and Outputs (objective functions and sensors) is introduced for the control design of convectively unstable flow configurations. From the linearized Navier Stokes equations with the inputs and outputs, controllable, observable and balanced modes are extracted using the snapshot method. A balanced reduced-order model (ROM) is constructed and shown to capture the input output behaviour of the linearized Navier Stokes equations. This model is finally used to design H-2-feedback controller to suppress the growth or two-dimensional perturbations inside the boundary layer.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

Control design

Dynamics and control

External disturbances

Feedback controller

Flat plate

Input output analysis

Input-output

Linearized navier-stokes equations

Model reduction

Objective functions

Reduced order models

Snapshot method

Two-dimensional perturbation

Unstable flows

Aerodynamics

Boundary layers

Fluid dynamics

Linearization

Two dimensional

Viscous flow

Fluid mechanics

Strömningsmekanik

Publikations- och innehållstyp

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