Three-dimensional wake transition of a square cylinder

Three-Dimensional Instabilities in the Wake of a Circular Cylinder

Mark Thompson Kerry Hourigan John Sheridan Department of Mechanical Engineering, Monash University, Clayton, Australia • The twoand three-dimensional wake structure behind a circular cylinder has been computed using a high-order spectral element technique. For the two-dimensional computations the predictions are compared with accurate experimental results and agree to within experimental uncert...

Three-dimensional instabilities of a stratified cylinder wake

Three-dimensional vortex structures in a cylinder wake

The three-dimensionality of the velocity field in the wake of a circular cylinder has excited considerable interest and debate over the past decade. Presented here are experimental results that characterize the underlying vorticity field of such wakes. Using particle image velocimetry (PIV), instantaneous velocity fields were measured and from these the vorticity of the longitudinal vortices ly...

Confined three-dimensional stability analysis of the cylinder wake.

A spatially confined stability analysis is reported for the cylinder wake at Reynolds numbers 190 and 260. The two three-dimensional instabilities at these Reynolds numbers are shown to be driven by the flow just behind the cylinder.

Feedback Control of a Cylinder Wake Low-Dimensional Model

Nomenclature Ak = time-dependent coefŽ cient of the kth proper orthogonal decompositionmode Aest k = estimation of Ak B = matrix containing the bk coefŽ cients bk = coefŽ cients associatedwith the control input ck i j = coefŽ cients of the nonlinear function gk fa = control input resulting form external forcing of the cylinder gk = nonlinear function of the time-dependent low-dimensionalmodes J...