PIV(粒子成像测速)所获流体图像的小波分析
Flow past a cylinder in an unbound medium gives rise toself-sustained, limit cycle oscillations involving formationof a regular, periodically alternating Karman vortex street.However, little attention has been paid to the effect of anadjacent free surface on the development of the Karmanvortices and possible generation of new classes of the nearwakestructure[1], see Figure 1. The technique of ParticleImage Velocimetry (PIV) is a useful tool to this flow,considering that it is unsteady and multi-scale in nature.