Optimal Feedforward and Feedback Control of Vortex Shedding Using Trust-Region Algorithms

2002 ◽  
Author(s):  
A Ravi ◽  
Prasanth Nair ◽  
M Tan ◽  
W Price
Keyword(s):  
Feedback Control ◽  
Vortex Shedding ◽  
Trust Region ◽  
Trust Region Algorithms

Global convergence of trust-region algorithms for convex constrained minimization without derivatives

2013 ◽  
Vol 220 ◽  
pp. 324-330 ◽  
Author(s):  
P.D. Conejo ◽  
E.W. Karas ◽  
L.G. Pedroso ◽  
A.A. Ribeiro ◽  
M. Sachine
Keyword(s):  
Global Convergence ◽  
Trust Region ◽  
Constrained Minimization ◽  
Trust Region Algorithms

Suboptimal feedback control of vortex shedding at low Reynolds numbers

1999 ◽  
Vol 401 ◽  
pp. 123-156 ◽  
Author(s):  
CHULHONG MIN ◽  
HAECHEON CHOI
Keyword(s):  
Feedback Control ◽  
Vortex Shedding ◽  
Bluff Body ◽  
Inviscid Flow ◽  
Cylinder Surface ◽  
Control Procedure ◽  
Control Input ◽  
Flow Pressure ◽  
Cost Functionals ◽  
Suboptimal Feedback Control

The objective of this study is to develop a method of controlling vortex shedding behind a bluff body using control theory. A suboptimal feedback control procedure for local sensing and local actuation is developed and applied to the flow behind a circular cylinder. The location of sensors for feedback is limited to the cylinder surface and the control input from actuators is the blowing and suction on the cylinder surface. Three different cost functionals to be minimized (J1 and J2) or maximized (J3) are investigated: J1 is proportional to the pressure drag of the cylinder, J2 is the square of the difference between the target pressure (inviscid flow pressure) and real flow pressure on the cylinder surface, and J3 is the square of the pressure gradient on the cylinder surface, respectively. Given the cost functionals, the flow variable to be measured by the sensors and the control input from the actuators are determined from the suboptimal feedback control procedure. Several cases for each cost functional have been numerically simulated at Re = 100 and 160 to investigate the performance of the control algorithm. For all actuations, vortex shedding becomes weak or disappears, and the mean drag and drag/lift fluctuations significantly decrease. For a given magnitude of the blowing/suction, reducing J2 provides the largest drag reduction among the three cost functionals.

Feedback control of vortex shedding from an inclined flat plate

2010 ◽  
Vol 25 (1-4) ◽  
pp. 221-232 ◽  
Author(s):  
Won Tae Joe ◽  
Tim Colonius ◽  
Douglas G. MacMynowski
Keyword(s):  
Feedback Control ◽  
Flat Plate ◽  
Vortex Shedding
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