Feedback Control of a Circular Cylinder Wake in Experiment and Simulation (Invited)

2003 ◽  
Author(s):  
Stefan Siegel ◽  
Kelly Cohen ◽  
Tom McLaughlin
Keyword(s):  
Feedback Control ◽  
Circular Cylinder ◽  
Cylinder Wake ◽  
Experiment And Simulation

Simulations of three dimensional feedback control of a circular cylinder wake

2006 ◽  
Author(s):  
Jurgen Seidel ◽  
Stefan Siegel ◽  
Kelly Cohen ◽  
Volker Becker ◽  
Thomas McLaughlin
Keyword(s):  
Feedback Control ◽  
Circular Cylinder ◽  
Three Dimensional ◽  
Cylinder Wake

Feedback control of a circular cylinder wake with rotational oscillation

2008 ◽  
Vol 41 (1) ◽  
pp. 011403 ◽  
Author(s):  
Sang Bong Lee ◽  
Seung-Jin Baek ◽  
Hyung Jin Sung
Keyword(s):  
Feedback Control ◽  
Circular Cylinder ◽  
Cylinder Wake ◽  
Rotational Oscillation

Feedback control of a circular cylinder wake

2008 ◽  
Vol 223 (4) ◽  
pp. 379-392 ◽  
Author(s):  
J Seidel ◽  
S Siegel ◽  
C Fagley ◽  
K Cohen ◽  
T McLaughlin
Keyword(s):  
Feedback Control ◽  
Circular Cylinder ◽  
Cylinder Wake

scholarly journals The drag-adjoint field of a circular cylinder wake at Reynolds numbers 20, 100 and 500

2013 ◽  
Vol 730 ◽  
pp. 145-161 ◽  
Author(s):  
Qiqi Wang ◽  
Jun-Hui Gao
Keyword(s):  
Circular Cylinder ◽  
Flow Field ◽  
Unsteady Flow ◽  
Numerical Solutions ◽  
Reynolds Numbers ◽  
Adjoint Equations ◽  
Cylinder Wake ◽  
Near Wake ◽  
Navier Stokes Equation ◽  
D 20

AbstractThis paper analyses the adjoint solution of the Navier–Stokes equation. We focus on flow across a circular cylinder at three Reynolds numbers, ${\mathit{Re}}_{D} = 20, 100$ and $500$. The quantity of interest in the adjoint formulation is the drag on the cylinder. We use classical fluid mechanics approaches to analyse the adjoint solution, which is a vector field similar to a flow field. Production and dissipation of kinetic energy of the adjoint field is discussed. We also derive the evolution of circulation of the adjoint field along a closed material contour. These analytical results are used to explain three numerical solutions of the adjoint equations presented in this paper. The adjoint solution at ${\mathit{Re}}_{D} = 20$, a viscous steady state flow, exhibits a downstream suction and an upstream jet, the opposite of the expected behaviour of a flow field. The adjoint solution at ${\mathit{Re}}_{D} = 100$, a periodic two-dimensional unsteady flow, exhibits periodic, bean-shaped circulation in the near-wake region. The adjoint solution at ${\mathit{Re}}_{D} = 500$, a turbulent three-dimensional unsteady flow, has complex dynamics created by the shear layer in the near wake. The magnitude of the adjoint solution increases exponentially at the rate of the first Lyapunov exponent. These numerical results correlate well with the theoretical analysis presented in this paper.

scholarly journals Transition to Periodic Behaviour of Flow Past a Circular Cylinder under the Action of Fluidic Actuation in the Transitional Regime

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5069
Author(s):  
Wasim Sarwar ◽  
Fernando Mellibovsky ◽  
Md. Mahbub Alam ◽  
Farhan Zafar
Keyword(s):  
Circular Cylinder ◽  
Period Doubling ◽  
Underlying Mechanism ◽  
Time Dependent ◽  
Cylinder Wake ◽  
Transitional Regime ◽  
Periodic Behaviour ◽  
Vortex Shedding Frequency ◽  
Fluidic Actuation ◽  
Periodic Dynamics

This study focuses on the numerical investigation of the underlying mechanism of transition from chaotic to periodic dynamics of circular cylinder wake under the action of time-dependent fluidic actuation at the Reynolds number = 2000. The forcing is realized by blowing and suction from the slits located at ±90∘ on the top and bottom surfaces of the cylinder. The inverse period-doubling cascade is the underlying physical mechanism underpinning the wake transition from mild chaos to perfectly periodic dynamics in the spanwise-independent, time-dependent forcing at twice the natural vortex-shedding frequency.

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