Numerical computations on nonlinear wave forces and run-ups on a TLP in High waves

Abstract

A tension leg platform(TLP) may experience high wave run-ups and nonlinear wave forces in extreme waves due to smaller vertical motion responses as well as local wave amplifications. In this study, a Cartesian-grid based flow simulation method is applied to compute the nonlinear wave forces and run-ups on a TLP in high waves. The present simulation method solves the two-phase Navier-Stokes equations using finite volume discretization with a volume-of-fluid (VOF) method. As a simulation model, a TLP with four columns and a ring pontoon was considered in the CFD simulations. Present study focuses on nonlinear characteristics of wave forces and run-ups on the TLP under both regular and irregular wave conditions. CFD simulation results are directly compared with linear potential solutions. Discussion is made on nonlinear characteristics of wave forces and run-ups on the TLP. Copyright ？ 2017 by the International Society of Offshore and Polar Engineers (ISOPE).