Computational fluid and structure dynamics methods to assess wave-induced loads and hydroelasticity effects

摘要

The flow around ship and offshore structures in heavy seas is characterized by strong nonlinear- ities such as braking waves, air trapping, highly peaked local pressures of short duration, and compressibility of water and air pockets. Moreover, the influence of hydroelasticity may have to be accounted for as well. Methods that directly solve the coupled Reynolds-averaged Navier-Stokes (RANS) equations) for the two-phase flow of water and air and the equations of motions for an elastic body are better able to describe the physics associated with these phenomena. However, the computational effort for these methods to compute motions and loads on ship and offshore structures at small, successive instances of time over a long time period is still high. This chapter describes a state-of-art computational methods based on an extended (with nonlinear rigid body motions) Reynolds-averaged Navier-Stokes equations solver, and a finite element method (FEM) to obtain the wave-induced motions and loads on ship and offshore structures in extreme waves.