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Research Papers: Multiphase Flows

On the Interaction of Water Waves With a Surface-Parallel Vortex

[+] Author and Article Information
Amy Warncke Lang

Department of Aerospace Engineering & Mechanics, University of Alabama, Box 870280, Tuscaloosa, AL 35487

William D. Thacker

Department of Physics & Center for Fluids at All Scales, Saint Louis University, 3450 Lindell Boulevard, St. Louis, MO 63103

J. Fluids Eng 130(5), 051302 (Apr 29, 2008) (7 pages) doi:10.1115/1.2907430 History: Received June 14, 2006; Revised February 26, 2008; Published April 29, 2008

An experimental study was performed to investigate the interaction of water waves with a surface-parallel oriented vortex at a free surface. Shadowgraph images were obtained visualizing surface deformations. The role of vortex strength and the direction of approach of the waves were investigated. For favorable waves, with flow velocity at crests parallel to vortex flow, surface deformations were weaker, lasted longer than for a vortex without waves, and were characterized at late times by the appearance of surface-normal vortices. For unfavorable waves incident on the vortex from the other side, surface deformations were stronger and dissipated more quickly.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Diagram of the experimental setup showing the case for unfavorable waves

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Figure 2

Characteristic time sequence of shadowgraph images for the weak vortex interacting with a calm surface

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Figure 3

Characteristic time sequence of shadowgraph images for the strong vortex interacting with a calm surface

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Figure 4

Characteristic time sequence of shadowgraph images for a weak vortex interacting with unfavorable waves of 4.3cm and less in wavelength

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Figure 5

Characteristic time sequence of shadowgraph images for a weak vortex interacting with favorable waves of 4.3cm and less in wavelength. Note that at t*=11.44 the field of view in the test area was moved to the right with respect to the previous images. At t*=17.9, note the dark circle that is a representative of the connection of a strong vortex filament to the free surface.

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Figure 6

Characteristic time sequence of shadowgraph images for a strong vortex interacting with unfavorable waves of 4.3cm and less in wavelength. Note that at t*=17.56, the field of view in the test area was moved to the right with respect to the previous images.

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Figure 7

Characteristic time sequence of shadowgraph images for a strong vortex interacting with favorable waves of 4.3cm and less in wavelength. Note that at t*=17.56, the field of view in the test area was moved to the right with respect to the previous images.

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Figure 8

Characteristic time sequence of shadowgraph images for a strong vortex interacting with unfavorable waves of 2.0cm wavelength

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Figure 9

Characteristic time sequence of shadowgraph images for a weak vortex interacting with favorable waves of 2.0cm wavelength. Note that at t*=14.16, the field of view in the test area was moved to the right with respect to the previous image.

Grahic Jump Location
Figure 10

Characteristic time sequence of shadowgraph images for a weak vortex interacting with unfavorable waves of 2.0cm wavelength

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