Free-Surface Wave Interaction with a Stationary Horizontal Cylinder
Peter Oshkai
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Department of Mechanical Engineering > University of Victoria
Free-surface wave interaction with a stationary horizontal cylinder.
A free-surface wave system induces formation of pronounced concentrations of positive and negative vorticity from the cylinder. Vorticity concentration A initially moves up and away from the surface of the cylinder (N = 9) and reverses direction to eventually collide with the surface of the cylinder (N = 11). Simultaneously, concentrations B and D form along the surface of the cylinder (N = 7) and migrate about the cylinder in the clockwise direction (N = 9). Concentration B eventually separates from its surface (N = 11). Concentration C undergoes large-scale orbital motion about the cylinder. The corresponding patterns of velocity and streamline topology indicate that even though the pattern of vorticity concentrations of frame N = 9 is mildly altered relative to that at N = 7, the change in predominant direction of the wave velocity field induces a dramatic switch in location of the saddle point and, in frame N = 11, this type of singularity is no longer evident.
P. Oshkai and D. Rockwell.
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poshkai@me.uvic.ca