A noncausal framework for model-based feedback control of spatially developing perturbations in boundary-layer flow systems. Part II: numerical simulations using state feedback

2004 ◽  
Vol 51 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Patricia Cathalifaud ◽  
Thomas R. Bewley
Keyword(s):  
Boundary Layer ◽  
Feedback Control ◽  
Numerical Simulations ◽  
Boundary Layer Flow ◽  
State Feedback ◽  
Model Based ◽  
Flow Systems ◽  
Layer Flow

Optimal feedback control applied to boundary layer flow

2005 ◽  
Vol 6 ◽  
pp. N25 ◽  
Author(s):  
DAN S. HENNINGSON ◽  
MARKUS HÖGBERG ◽  
MATTIAS CHEVALIER
Keyword(s):  
Boundary Layer ◽  
Feedback Control ◽  
Boundary Layer Flow ◽  
Optimal Feedback Control ◽  
Optimal Feedback ◽  
Layer Flow

A Numerically Tractable Global Framework for the Feedback Control of Boundary-Layer Perturbations

2002 ◽  
Author(s):  
Patricia Cathalifaud ◽  
Thomas R. Bewley
Keyword(s):  
Boundary Layer ◽  
Feedback Control ◽  
Cost Function ◽  
Large Class ◽  
Control Strategy ◽  
Boundary Layer Flow ◽  
Control Rules ◽  
Layer Flow ◽  
Feedback Control Strategy ◽  
Differential Riccati Equations

We present a global framework for the feedback control of a large class of spatially-developing boundary-layer flow systems. The systems considered are (approximately) parabolic in the spatial coordinate x. This facilitates the application of a range of established feedback control theories which are based on the solution of differential Riccati equations which march over a finite horizon in x (rather than marching in t, as customary). However, unlike systems which are parabolic in time, there is no causality constraint for the feedback control of systems which are parabolic in space; that is, downstream information may be used to update the controls upstream. Thus, a particular actuator may be used to neutralize the effects of a disturbance which actually enters the system downstream of the actuator location. In the present study, a numerically-tractable feedback control strategy is proposed which takes advantage of this special capability of feedback control rules in the spatially-parabolic setting in order to minimize a globally-defined cost function in an effort to maintain laminar boundary-layer flow.

Numerical simulations of turbulent spots in plane Poiseuille and boundary-layer flow

1987 ◽  
Vol 30 (10) ◽  
pp. 2914 ◽  
Author(s):  
Dan Henningson ◽  
Philippe Spalart ◽  
John Kim
Keyword(s):  
Boundary Layer ◽  
Numerical Simulations ◽  
Boundary Layer Flow ◽  
Turbulent Spots ◽  
Layer Flow
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