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Dispersion around a circular cylinder in surface wave motion

Tofighi, M. A ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. In this paper, we examine fluid flow and associated dispersion around a circular cylinder under progressive surface wave motion. The flow field and vortex shedding patterns were studied using flow visualization and Particle Image Velocimetry (PIV). Several patterns of vortex shedding were identified around a single cylinder. The vortex shedding patterns under progressive wave motion are similar to those observed in planar oscillatory flow, except in the way the vortices form and in the orientation they take. The observed vortex patterns in progressive wave motion are more unstable than those in planar oscillatory flow. Using particle tracking and the Lagrangian dispersion method, the dispersion coefficients were calculated for various flow regimes. The observations confirm the calculations in general. It was also found that wave steepness can affect the shedding pattern. The vortices tend to shed more frequently in a wave direction at low wave steepness
  4. Keywords:
  5. Circular cylinders ; Dispersion (waves) ; Lagrange multipliers ; Velocimeters ; Velocity measurement ; Vortex flow ; Dispersion coefficient ; Lagrangian dispersion ; Particle image velocimetries ; Particle tracking ; Progressive wave motions ; Surface wave motion ; Vortex shedding patterns ; Flow visualization ; Cylinder ; Dispersion ; Flow field ; Fluid flow ; Lagrangian analysis ; Oscillating flow ; Surface wave ; Vortex shedding ; Water wave ; Wave direction
  6. Source: Scientia Iranica ; Vol. 21, issue. 3 , 2014 , p. 548-556 ; 10263098
  7. URL: http://www.scientiairanica.com/en/ManuscriptDetail?mid=389