This video shows a PIV (Particle Image Velocimetry) analysis of a flow. The ProAnalyst PIV toolkit tracks the movement in the flow and calculates a series of velocity vectors representing the flow over time. Vector fields, represented by a grid with directional arrows, are drawn on top of the image. PIV also produces a colorized contour map of the flow. The PIV toolkit is ideal for researchers who study aerodynamics, fluidics, and flows.