Surface pressure and flow field behind an oscillating fence submerged in turbulent boundary layer

Surface pressure and flow field behind an oscillating fence submerged in turbulent boundary layer Phase-locked PSP and PIV measurements were used to study the evolution of three-dimensional disturbances produced by an oscillating fence actuator immersed in a zero pressure gradient turbulent boundary layer. For the single fence frequency studied, strong three-dimensionality is observed in the vortical structure that varies along the span of the fence soon after the fence enters the flow. At the midspan, the structure grows, weakens, and convects faster than at other locations. As the fence height increases, the data indicate that the vortical structure terminates near the edge of the fence. In contrast, the vortex structure terminates on the plate surface adjacent to the fence edge as the fence descends, similar to a wake vortex of a stationary obstacle. This study demonstrates that the combined use of surface and flow-field diagnostics provide a link between flow field and surface features, yielding an understanding of the flow that would have not been possible with any one technique. Experiments in Fluids Springer Journals

Surface pressure and flow field behind an oscillating fence submerged in turbulent boundary layer

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Copyright © 2010 by Springer-Verlag
Engineering; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer; Engineering Fluid Dynamics
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