Spacing effects on hydrodynamics of heave plates on offshore structures

L. Tao, B. Molin, Y. M. Scolan, K. Thiagarajan

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60 Citations (Scopus)


The nonlinear viscous flow problem associated with a heaving vertical cylinder with two heave plates in the form of two circular disks attached is solved using a finite difference method. Numerical experiments are carried out to investigate the spanwise length effects on the hydrodynamic properties, such as added mass and damping coefficients. Over a Keulegan-Carpenter (KC) number range from 0.1 to 0.6 at frequency parameter (β = 7.869 × 107), calculations indicate that a KC-dependent critical value of spanwise length L / Dd (L-the distance between the disks, and Dd-the diameter of the disks) exists. A significant influence of L / Dd on the vortex shedding patterns around the disks and the hydrodynamic coefficients is revealed when L / Dd is smaller than the critical value due to strong interaction between vortices of different disks. Beyond that limit, however, both added mass and damping coefficients are shown to be rather stable, indicating the independence of the vortex shedding processes of different disks.

Original languageEnglish
Pages (from-to)1119-1136
Number of pages18
JournalJournal of Fluids and Structures
Issue number8
Publication statusPublished - Nov 2007


  • added mass
  • heave plate
  • spar
  • viscous damping
  • vortex shedding
  • nonlinear viscous flow
  • finite difference method
  • hydrodynamic properties
  • hydrodynamic coefficients


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