The Numerical Simulation Of Interaction Of Water Waves And Floating Structures In A Viscous Fluid

The interaction of water waves with floating structures is of considerable importance for the exploitation of resources in ocean. However, the ability of the linear potential theory will be limited under the many cases, because they are non-linear problems. The numerical wave flume based on the viscous fluid theory will be a more effective and direct way to solve such non-linear hydrodynamic problems.On the basis of reviewing and summarizing the recent research progress of this subject, the work in the following aspects has been carried out:In Chapterâ…¡, based on the N-S equation, the VOF method is used to track the free surface, the additive sources in the momentum equation are used to generate and absorb waves, the method of waves generating and absorbing in the viscous fluid is presented. The numerical wave flume which can both generate and absorb waves is obtained. The validity of waves generating and absorbing is numerically confirmed.In Chapterâ…¢, based on the numerical wave flume, the interaction between water waves and the cylinder with the perforated outer wall is numerically simulated. Numerical results are presented to show that the effects of different porosities of the outer cylinder and different wave-effect parameter are important effects to the wave forces on the inner cylinder, and it is found that changing the porosity of the outer cylinder can decrease the wave force on the inner cylinder.In Chapterâ…£, based on the proposed numerical wave flume, the interaction of water waves with the semi-submersible platform is numerically simulated. Wave forces on the semi-submersible platform are calculated, and the characteristics of free surface field and velocity field around the semi-submersible platform are analysized.