Numerical Modelling of Wave Run-Up: Regular Waves

Ramirez, Jorge (Department of Civil Engineering, Aalborg University) | Frigaard, Peter (Department of Civil Engineering, Aalborg University) | Andersen, Thomas Lykke (Department of Civil Engineering, Aalborg University) | Christensen, Erik Damgaard (Department of Mechanical Engineering, Technical University of Denmark)

OnePetro 

ABSTRACT:

Wave loads are important in problems related to offshore structure, such as wave run-up, slamming. The computation of such wave problems are carried out by CFD models. This paper presents one model, NS3, which solve 3D Navier-Stokes equations and use Volume of Fluid (VOF) method to treat the free surface. NS3 is used to simulate the wave run-up due to a regular wave to calculate the maximum wave run-up around a cylinder. The aim of this paper is shown the calculations of NS3 code and compared with the data obtained from the large scale test performed in Grossen Wellenkanal (GWK) at ForschungszentrumKüste (FZK) in Hannover, Germany.



INTRODUCTION

Offshore wind power is a highlight of many magazines and newspaper around the world, the infamous COP 15 had it like a relevant topic in its agenda and is considered an important key against global warming. Research on offshore wind energy is widely performed by numerical models and experimental tests. The problem modelling interactions with waves and offshore structures have been of great interest in the last decades, with the advection of new computational power, the advanced of numerical methods have turned up for modelling complex phenomenon. The wave run-up is defined as the vertical up rush of water that is a result of an incident wave train breaking on a partially immersed body. Wave run-up has been studied for the last 6 decades; (McCamy and Fuchs, 1954) solved this problem analytically by extending Havelock''s linear potential theory. (Kriebel, 1990; Niedzwecki and Huston., 1992), have studied the problem using the second order solutions. NS3 calculations shown here are based on simulated solutions to Navier-Stokes equations. The prediction of the free surface is based on the volume of fluid (VOF). This method is developed to simulate highly nonlinear effects.