W. Bank

Further Visualization of Combined Wing Tip and Starting Vortex Systems

Visualisation des systemes de tourbillons dans un ecoulement demarrant a acceleration constante

Toward dynamic separation without dynamic stall

Visualization of flow around a pitching airfoil with a rotating nose demonstrates the technically interesting concept of dynamic separation without dynamic stall.

Starting Flow Over Spoilers, Double Steps and Cavities

The development of two-dimensional vortex patterns in accelerating flow starting from rest has been investigated by streakline visualization and documented in photographic sequences. We considered flow over spoilers, double steps and cavities. A limited parametric analysis is provided for some of the photographic results.

Visualization of the vortex street behind a circular cylinder at low Reynolds numbers

Vortical filament development behind a circular cylinder immersed in steady flow is documented in photographic sequences at Reynolds numbers 70, 120, and 300.

Reynolds number dependence of vortex patterns in accelerated flow around airfoils

Reynolds number dependence of vortical patterns visualized by smoke technique in accelerating flow behind airfoils is documented in photographic sequences at angles of attack 20° and 60°. At low Reynolds numbers the vortical pattern development is quite simple. With increasing Reynolds numbers these patterns become increasingly complex, and onset of turbulence occurs early and generates large scale turbulent vortex patterns.