Transient dynamics of the flow around a NACA 0015 airfoil using fluidic vortex generators

Control of vortex shedding on two- and three-dimensional aerofoils

“…The maximum lift increment is also quite similar to the time-averaged value when actuators are operated continuously at f + = 1.16, shown in figure 2. The duration of the pulse, t + ≈ 10, scales well with convective time units, and is similar to that measured by Amitay & Glezer [37] and Siauw et al [40] with different actuators. In figure 4, we have superposed the lift response from a companion experiment in which synthetic jet actuators were used, as well as results from Woo et al [30], who used a NACA4415 at a = 20 • with Re = 570 000 and a burst from a pulse combustion actuator.…”

“…Following this, a fresh LEV begins to form and is eventually shed, in a process that appears similar to that which occurs following the initial separation on an impulsively started aerofoil and the dynamic stall process during rapid pitch up. We note that Siauw et al [40] report being able to capture the dynamics of the transient process with a four-state dynamical system using a proper orthogonal decomposition (POD)/Galerkin projection approach.…”

Comparison of a separated flow response to localized and global-type disturbances

“…Darabi and Wygnanski (2004a, b) used zero-net-mass actuation to study the reattachment process and the separation process on flow over a flap. Siauw et al (2010) used step-on and step-off signals to vortex generator jets to reattach and separate the separated flow on a NACA 0015 airfoil. A short-duration pulse-like input was also studied by Amitay and Glezer (2006) on the 24 % thickness airfoil.…”

Numerical and Experimental Investigations of Lift and Drag Performances of NACA 0015 Wind Turbine Airfoil

“…Siauw et al, studied on transient dynamics of the flow around the NACA 0015 airfoil by using fluid vortex generator. They experimentally investigated flow separation on NACA 0015 airfoil at 1×10 6 Reynolds number [8]. Srinivosan et al, studied on evaluation of turbulence models for unsteady flows of an oscillating airfoil.…”