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Spacing effects on hydrodynamics of heave plates on offshore structures

Lookup NU author(s): Professor Longbin Tao

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Abstract

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 beta=7.869x10^7, 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.

Publication metadata

Author(s): Tao L, Molin B, Scolan Y-M, Thiagarajan K

Publication type: Article

Publication status: Published

Journal: Journal of Fluids and Structures

Year: 2007

Volume: 23

Issue: 8

Pages: 1119-1136

Print publication date: 01/11/2007

Date deposited: 16/07/2010

ISSN (print): 0889-9746

ISSN (electronic): 1095-8622

Publisher: Academic Press

URL: http://dx.doi.org/10.1016/j.jfluidstructs.2007.03.004

DOI: 10.1016/j.jfluidstructs.2007.03.004

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