PC-Based wave load computation for large volume multi-column structures
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In this paper, analytic diffraction and radiation solutions for arrays of bottom-mounted vertical circular cylinders are used to compute hydrodynamic forces on deep-draft-column-based offshore platform, such as tension-leg platforms (TLP) and very large floating structures (VLFS). In order to account for the effects of the cylinder bottom and pontoon, rational bottom and pontoon corrections are also developed. The numerical results are validated through the comparisons with those obtained from three-dimensional boundary element programs. The present method is especially powerful when the number of legs is large, for which the use of existing panel programs seems infeasible. The present method quickly produces reasonably accurate solutions with minimal memory requirement and is free of laborious grid generation and convergence test,hence is particularly suitable for the parametric study of large-volume multi-column structures in the preliminary design stage.